chore(i18n,curriculum): update translations
This commit is contained in:
camperbot
committed by
Mrugesh Mohapatra
Mrugesh Mohapatra
parent
e139fbcf13
commit
c1fb339bbc
@ -18,9 +18,9 @@ dashedName: access-array-data-with-indexes
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**示例**
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```js
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var array = [50,60,70];
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const array = [50, 60, 70];
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array[0];
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var data = array[1];
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const data = array[1];
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```
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現在 `array[0]` 的值是 `50`， `data` 的值爲 `60`.
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@ -76,7 +76,7 @@ if(typeof myArray !== "undefined" && typeof myData !== "undefined"){(function(y,
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## --seed-contents--
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```js
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var myArray = [50,60,70];
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const myArray = [50, 60, 70];
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```
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@ -84,6 +84,6 @@ var myArray = [50,60,70];
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# --solutions--
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```js
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var myArray = [50,60,70];
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var myData = myArray[0];
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const myArray = [50, 60, 70];
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const myData = myArray[0];
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```
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@ -14,12 +14,13 @@ dashedName: access-multi-dimensional-arrays-with-indexes
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**例如：**
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```js
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var arr = [
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[1,2,3],
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[4,5,6],
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[7,8,9],
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[[10,11,12], 13, 14]
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const arr = [
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[1, 2, 3],
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[4, 5, 6],
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[7, 8, 9],
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[[10, 11, 12], 13, 14]
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];
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arr[3];
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arr[3][0];
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arr[3][0][1];
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@ -58,14 +59,19 @@ if(typeof myArray !== "undefined"){(function(){return "myData: " + myData + " my
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## --seed-contents--
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```js
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var myArray = [[1,2,3], [4,5,6], [7,8,9], [[10,11,12], 13, 14]];
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const myArray = [
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[1, 2, 3],
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[4, 5, 6],
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[7, 8, 9],
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[[10, 11, 12], 13, 14],
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];
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var myData = myArray[0][0];
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const myData = myArray[0][0];
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```
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# --solutions--
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```js
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var myArray = [[1,2,3],[4,5,6], [7,8,9], [[10,11,12], 13, 14]];
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var myData = myArray[2][1];
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const myArray = [[1, 2, 3], [4, 5, 6], [7, 8, 9], [[10, 11, 12], 13, 14]];
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const myData = myArray[2][1];
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```
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@ -14,7 +14,7 @@ dashedName: accessing-nested-arrays
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下面是訪問嵌套數組的例子：
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```js
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var ourPets = [
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const ourPets = [
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{
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animalType: "cat",
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names: [
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@ -32,6 +32,7 @@ var ourPets = [
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]
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}
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];
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ourPets[0].names[1];
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ourPets[1].names[0];
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```
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@ -72,7 +73,7 @@ assert(/=\s*myPlants\[1\].list\[1\]/.test(code));
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## --seed-contents--
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```js
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var myPlants = [
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const myPlants = [
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{
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type: "flowers",
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list: [
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@ -91,13 +92,13 @@ var myPlants = [
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}
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];
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var secondTree = "";
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const secondTree = "";
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```
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# --solutions--
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```js
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var myPlants = [
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const myPlants = [
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{
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type: "flowers",
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list: [
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@ -116,5 +117,5 @@ var myPlants = [
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}
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];
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var secondTree = myPlants[1].list[1];
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const secondTree = myPlants[1].list[1];
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```
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@ -14,7 +14,7 @@ dashedName: accessing-nested-objects
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這是一個嵌套對象：
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```js
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var ourStorage = {
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const ourStorage = {
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"desk": {
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"drawer": "stapler"
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},
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@ -26,6 +26,7 @@ var ourStorage = {
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"bottom drawer": "soda"
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}
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};
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ourStorage.cabinet["top drawer"].folder2;
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ourStorage.desk.drawer;
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```
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@ -66,7 +67,7 @@ assert(/=\s*myStorage\.car\.inside\[\s*("|')glove box\1\s*\]/g.test(code));
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## --seed-contents--
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```js
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var myStorage = {
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const myStorage = {
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"car": {
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"inside": {
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"glove box": "maps",
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@ -78,13 +79,13 @@ var myStorage = {
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}
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};
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var gloveBoxContents = undefined;
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const gloveBoxContents = undefined;
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```
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# --solutions--
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```js
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var myStorage = {
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const myStorage = {
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"car":{
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"inside":{
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"glove box":"maps",
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@ -95,5 +96,5 @@ var myStorage = {
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}
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}
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};
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var gloveBoxContents = myStorage.car.inside["glove box"];
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const gloveBoxContents = myStorage.car.inside["glove box"];
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```
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@ -16,11 +16,12 @@ dashedName: accessing-object-properties-with-bracket-notation
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這是一個使用方括號表示法讀取對象屬性的例子：
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```js
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var myObj = {
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const myObj = {
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"Space Name": "Kirk",
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"More Space": "Spock",
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"NoSpace": "USS Enterprise"
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};
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myObj["Space Name"];
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myObj['More Space'];
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myObj["NoSpace"];
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@ -78,26 +79,25 @@ assert(code.match(/testObj\s*?\[('|")[^'"]+\1\]/g).length > 1);
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```js
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// Setup
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var testObj = {
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const testObj = {
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"an entree": "hamburger",
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"my side": "veggies",
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"the drink": "water"
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};
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// Only change code below this line
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var entreeValue = testObj; // Change this line
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var drinkValue = testObj; // Change this line
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const entreeValue = testObj; // Change this line
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const drinkValue = testObj; // Change this line
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```
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# --solutions--
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```js
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var testObj = {
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const testObj = {
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"an entree": "hamburger",
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"my side": "veggies",
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"the drink": "water"
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};
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var entreeValue = testObj["an entree"];
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var drinkValue = testObj['the drink'];
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const entreeValue = testObj["an entree"];
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const drinkValue = testObj['the drink'];
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```
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@ -16,15 +16,17 @@ dashedName: accessing-object-properties-with-dot-notation
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這裏是一個用點符號（`.`）讀取對象屬性的示例：
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```js
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var myObj = {
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const myObj = {
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prop1: "val1",
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prop2: "val2"
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};
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var prop1val = myObj.prop1;
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var prop2val = myObj.prop2;
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const prop1val = myObj.prop1;
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const prop2val = myObj.prop2;
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```
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`prop1val` 的值將爲字符串 `val1`，並且`prop2val` 的值將爲字符串 `val2`。
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# --instructions--
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使用點號讀取 `testObj` 的屬性值。 將變量 `hatValue` 的值設置爲該對象的 `hat` 屬性的值，並將變量 `shirtValue` 的值設置爲該對象的 `shirt` 屬性的值。
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@ -73,27 +75,26 @@ assert(code.match(/testObj\.\w+/g).length > 1);
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```js
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// Setup
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var testObj = {
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const testObj = {
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"hat": "ballcap",
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"shirt": "jersey",
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"shoes": "cleats"
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};
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// Only change code below this line
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var hatValue = testObj; // Change this line
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var shirtValue = testObj; // Change this line
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const hatValue = testObj; // Change this line
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const shirtValue = testObj; // Change this line
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```
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# --solutions--
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```js
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var testObj = {
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const testObj = {
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"hat": "ballcap",
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"shirt": "jersey",
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"shoes": "cleats"
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};
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var hatValue = testObj.hat;
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var shirtValue = testObj.shirt;
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const hatValue = testObj.hat;
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const shirtValue = testObj.shirt;
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```
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@ -14,11 +14,14 @@ dashedName: accessing-object-properties-with-variables
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以下是一個使用變量來訪問屬性的例子：
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```js
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var dogs = {
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Fido: "Mutt", Hunter: "Doberman", Snoopie: "Beagle"
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const dogs = {
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Fido: "Mutt",
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Hunter: "Doberman",
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Snoopie: "Beagle"
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};
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var myDog = "Hunter";
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var myBreed = dogs[myDog];
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const myDog = "Hunter";
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const myBreed = dogs[myDog];
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console.log(myBreed);
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```
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@ -27,14 +30,16 @@ console.log(myBreed);
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使用這一概念的另一種情況是：屬性的名字是在程序運行期間動態收集得到的。如下所示：
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```js
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var someObj = {
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const someObj = {
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propName: "John"
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};
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function propPrefix(str) {
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var s = "prop";
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const s = "prop";
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return s + str;
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}
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var someProp = propPrefix("Name");
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const someProp = propPrefix("Name");
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console.log(someObj[someProp]);
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```
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@ -96,26 +101,25 @@ if(typeof player !== "undefined"){(function(v){return v;})(player);}
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```js
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// Setup
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var testObj = {
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const testObj = {
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12: "Namath",
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16: "Montana",
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19: "Unitas"
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};
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// Only change code below this line
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var playerNumber; // Change this line
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var player = testObj; // Change this line
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const playerNumber = 42; // Change this line
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const player = testObj; // Change this line
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```
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# --solutions--
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```js
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var testObj = {
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const testObj = {
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12: "Namath",
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16: "Montana",
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19: "Unitas"
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};
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var playerNumber = 16;
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var player = testObj[playerNumber];
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const playerNumber = 16;
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const player = testObj[playerNumber];
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```
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@ -28,7 +28,7 @@ ourDog["bark"] = "bow-wow";
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例如：
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```js
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var ourDog = {
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const ourDog = {
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"name": "Camper",
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"legs": 4,
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"tails": 1,
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@ -67,7 +67,7 @@ assert(!/bark[^\n]:/.test(code));
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## --seed-contents--
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```js
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var myDog = {
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const myDog = {
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"name": "Happy Coder",
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"legs": 4,
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"tails": 1,
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@ -80,7 +80,7 @@ var myDog = {
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# --solutions--
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```js
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var myDog = {
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const myDog = {
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"name": "Happy Coder",
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"legs": 4,
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"tails": 1,
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@ -18,7 +18,7 @@ JavaScript 中，我們通過符號 `+` 來進行加法運算。
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**代碼示例:**
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```js
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myVar = 5 + 10;
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const myVar = 5 + 10;
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```
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現在，變量 `myVar` 的值爲 `15`。
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@ -52,11 +52,11 @@ assert(/\+/.test(code));
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## --seed-contents--
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```js
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var sum = 10 + 0;
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const sum = 10 + 0;
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```
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# --solutions--
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```js
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var sum = 10 + 10;
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const sum = 10 + 10;
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```
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@ -92,7 +92,7 @@ assert(code.match(/break/g).length > 2);
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```js
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function switchOfStuff(val) {
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var answer = "";
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let answer = "";
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// Only change code below this line
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@ -108,7 +108,7 @@ switchOfStuff(1);
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```js
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function switchOfStuff(val) {
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var answer = "";
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let answer = "";
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switch(val) {
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case "a":
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@ -14,8 +14,8 @@ dashedName: appending-variables-to-strings
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示例：
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```js
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var anAdjective = "awesome!";
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var ourStr = "freeCodeCamp is ";
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const anAdjective = "awesome!";
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let ourStr = "freeCodeCamp is ";
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ourStr += anAdjective;
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```
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@ -64,15 +64,14 @@ assert(code.match(/myStr\s*\+=\s*someAdjective\s*/).length > 0);
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```js
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// Change code below this line
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var someAdjective;
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var myStr = "Learning to code is ";
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const someAdjective = "";
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let myStr = "Learning to code is ";
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```
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# --solutions--
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```js
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var someAdjective = "neat";
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var myStr = "Learning to code is ";
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const someAdjective = "neat";
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let myStr = "Learning to code is ";
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myStr += someAdjective;
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```
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@ -18,7 +18,7 @@ dashedName: build-javascript-objects
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這裏是一個貓對象的樣本：
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```js
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var cat = {
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const cat = {
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"name": "Whiskers",
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"legs": 4,
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"tails": 1,
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@ -29,7 +29,7 @@ var cat = {
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在此示例中，所有屬性都存儲爲字符串，例如 `name`、`legs` 和 `tails`。 然而，你也可以使用數字作爲屬性。 你甚至可以省略單字字符串屬性中的引號，如下所示：
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```js
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var anotherObject = {
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const anotherObject = {
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make: "Ford",
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5: "five",
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"model": "focus"
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@ -139,18 +139,18 @@ assert(
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## --seed-contents--
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```js
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var myDog = {
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// Only change code below this line
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const myDog = {
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// Only change code below this line
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// Only change code above this line
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// Only change code above this line
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};
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```
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# --solutions--
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```js
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var myDog = {
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const myDog = {
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"name": "Camper",
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"legs": 4,
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"tails": 1,
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@ -16,7 +16,7 @@ dashedName: comparison-with-the-equality-operator
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```js
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function equalityTest(myVal) {
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if (myVal == 10) {
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return "Equal";
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return "Equal";
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}
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return "Not Equal";
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}
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@ -20,7 +20,7 @@ myVar = myVar + 5;
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其中一種就是 `+=` 運算符。
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```js
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var myVar = 1;
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let myVar = 1;
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myVar += 5;
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console.log(myVar);
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```
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@ -61,9 +61,9 @@ assert(code.match(/\+=/g).length === 3);
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```js
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assert(
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/var a = 3;/.test(code) &&
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/var b = 17;/.test(code) &&
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/var c = 12;/.test(code)
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/let a = 3;/.test(code) &&
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/let b = 17;/.test(code) &&
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/let c = 12;/.test(code)
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);
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```
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@ -78,9 +78,9 @@ assert(
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var a = 3;
|
||||
var b = 17;
|
||||
var c = 12;
|
||||
let a = 3;
|
||||
let b = 17;
|
||||
let c = 12;
|
||||
|
||||
// Only change code below this line
|
||||
a = a + 12;
|
||||
@ -91,9 +91,9 @@ c = c + 7;
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var a = 3;
|
||||
var b = 17;
|
||||
var c = 12;
|
||||
let a = 3;
|
||||
let b = 17;
|
||||
let c = 12;
|
||||
|
||||
a += 12;
|
||||
b += 9;
|
||||
|
||||
@ -55,9 +55,9 @@ assert(code.match(/\/=/g).length === 3);
|
||||
|
||||
```js
|
||||
assert(
|
||||
/var a = 48;/.test(code) &&
|
||||
/var b = 108;/.test(code) &&
|
||||
/var c = 33;/.test(code)
|
||||
/let a = 48;/.test(code) &&
|
||||
/let b = 108;/.test(code) &&
|
||||
/let c = 33;/.test(code)
|
||||
);
|
||||
```
|
||||
|
||||
@ -72,9 +72,9 @@ assert(
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var a = 48;
|
||||
var b = 108;
|
||||
var c = 33;
|
||||
let a = 48;
|
||||
let b = 108;
|
||||
let c = 33;
|
||||
|
||||
// Only change code below this line
|
||||
a = a / 12;
|
||||
@ -85,9 +85,9 @@ c = c / 11;
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var a = 48;
|
||||
var b = 108;
|
||||
var c = 33;
|
||||
let a = 48;
|
||||
let b = 108;
|
||||
let c = 33;
|
||||
|
||||
a /= 12;
|
||||
b /= 4;
|
||||
|
||||
@ -55,9 +55,9 @@ assert(code.match(/\*=/g).length === 3);
|
||||
|
||||
```js
|
||||
assert(
|
||||
/var a = 5;/.test(code) &&
|
||||
/var b = 12;/.test(code) &&
|
||||
/var c = 4\.6;/.test(code)
|
||||
/let a = 5;/.test(code) &&
|
||||
/let b = 12;/.test(code) &&
|
||||
/let c = 4\.6;/.test(code)
|
||||
);
|
||||
```
|
||||
|
||||
@ -72,9 +72,9 @@ assert(
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var a = 5;
|
||||
var b = 12;
|
||||
var c = 4.6;
|
||||
let a = 5;
|
||||
let b = 12;
|
||||
let c = 4.6;
|
||||
|
||||
// Only change code below this line
|
||||
a = a * 5;
|
||||
@ -85,9 +85,9 @@ c = c * 10;
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var a = 5;
|
||||
var b = 12;
|
||||
var c = 4.6;
|
||||
let a = 5;
|
||||
let b = 12;
|
||||
let c = 4.6;
|
||||
|
||||
a *= 5;
|
||||
b *= 3;
|
||||
|
||||
@ -55,7 +55,7 @@ assert(code.match(/-=/g).length === 3);
|
||||
|
||||
```js
|
||||
assert(
|
||||
/var a = 11;/.test(code) && /var b = 9;/.test(code) && /var c = 3;/.test(code)
|
||||
/let a = 11;/.test(code) && /let b = 9;/.test(code) && /let c = 3;/.test(code)
|
||||
);
|
||||
```
|
||||
|
||||
@ -70,9 +70,9 @@ assert(
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var a = 11;
|
||||
var b = 9;
|
||||
var c = 3;
|
||||
let a = 11;
|
||||
let b = 9;
|
||||
let c = 3;
|
||||
|
||||
// Only change code below this line
|
||||
a = a - 6;
|
||||
@ -83,9 +83,9 @@ c = c - 1;
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var a = 11;
|
||||
var b = 9;
|
||||
var c = 3;
|
||||
let a = 11;
|
||||
let b = 9;
|
||||
let c = 3;
|
||||
|
||||
a -= 6;
|
||||
b -= 15;
|
||||
|
||||
@ -16,7 +16,7 @@ dashedName: concatenating-strings-with-the-plus-equals-operator
|
||||
例如：
|
||||
|
||||
```js
|
||||
var ourStr = "I come first. ";
|
||||
let ourStr = "I come first. ";
|
||||
ourStr += "I come second.";
|
||||
```
|
||||
|
||||
@ -57,14 +57,12 @@ assert(code.match(/myStr\s*\+=\s*(["']).*\1/g));
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
// Only change code below this line
|
||||
|
||||
var myStr;
|
||||
let myStr;
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myStr = "This is the first sentence. ";
|
||||
let myStr = "This is the first sentence. ";
|
||||
myStr += "This is the second sentence.";
|
||||
```
|
||||
|
||||
@ -14,8 +14,8 @@ dashedName: constructing-strings-with-variables
|
||||
例如：
|
||||
|
||||
```js
|
||||
var ourName = "freeCodeCamp";
|
||||
var ourStr = "Hello, our name is " + ourName + ", how are you?";
|
||||
const ourName = "freeCodeCamp";
|
||||
const ourStr = "Hello, our name is " + ourName + ", how are you?";
|
||||
```
|
||||
|
||||
`ourStr` 值爲 `Hello, our name is freeCodeCamp, how are you?`
|
||||
@ -63,13 +63,13 @@ assert(code.match(/["']\s*\+\s*myName\s*\+\s*["']/g).length > 0);
|
||||
|
||||
```js
|
||||
// Only change code below this line
|
||||
var myName;
|
||||
var myStr;
|
||||
const myName = "";
|
||||
const myStr = "";
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myName = "Bob";
|
||||
var myStr = "My name is " + myName + " and I am well!";
|
||||
const myName = "Bob";
|
||||
const myStr = "My name is " + myName + " and I am well!";
|
||||
```
|
||||
|
||||
@ -159,7 +159,7 @@ assert(
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var count = 0;
|
||||
let count = 0;
|
||||
|
||||
function cc(card) {
|
||||
// Only change code below this line
|
||||
@ -175,7 +175,7 @@ cc(2); cc(3); cc(7); cc('K'); cc('A');
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var count = 0;
|
||||
let count = 0;
|
||||
function cc(card) {
|
||||
switch(card) {
|
||||
case 2:
|
||||
|
||||
@ -42,13 +42,14 @@ assert(myDecimal % 1 != 0);
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var ourDecimal = 5.7;
|
||||
const ourDecimal = 5.7;
|
||||
|
||||
// Only change code below this line
|
||||
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myDecimal = 9.9;
|
||||
const myDecimal = 9.9;
|
||||
```
|
||||
|
||||
@ -39,7 +39,7 @@ assert(myVar === 10);
|
||||
|
||||
```js
|
||||
assert(
|
||||
/var\s*myVar\s*=\s*11;\s*\/*.*\s*([-]{2}\s*myVar|myVar\s*[-]{2});/.test(code)
|
||||
/let\s*myVar\s*=\s*11;\s*\/*.*\s*([-]{2}\s*myVar|myVar\s*[-]{2});/.test(code)
|
||||
);
|
||||
```
|
||||
|
||||
@ -52,7 +52,7 @@ assert(/[-]{2}\s*myVar|myVar\s*[-]{2}/.test(code));
|
||||
不應修改註釋上方的代碼。
|
||||
|
||||
```js
|
||||
assert(/var myVar = 11;/.test(code));
|
||||
assert(/let myVar = 11;/.test(code));
|
||||
```
|
||||
|
||||
# --seed--
|
||||
@ -66,7 +66,7 @@ assert(/var myVar = 11;/.test(code));
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var myVar = 11;
|
||||
let myVar = 11;
|
||||
|
||||
// Only change code below this line
|
||||
myVar = myVar - 1;
|
||||
@ -75,6 +75,6 @@ myVar = myVar - 1;
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myVar = 11;
|
||||
let myVar = 11;
|
||||
myVar--;
|
||||
```
|
||||
|
||||
@ -18,7 +18,7 @@ delete ourDog.bark;
|
||||
例如：
|
||||
|
||||
```js
|
||||
var ourDog = {
|
||||
const ourDog = {
|
||||
"name": "Camper",
|
||||
"legs": 4,
|
||||
"tails": 1,
|
||||
@ -70,7 +70,7 @@ assert(code.match(/"tails": 1/g).length > 0);
|
||||
|
||||
```js
|
||||
// Setup
|
||||
var myDog = {
|
||||
const myDog = {
|
||||
"name": "Happy Coder",
|
||||
"legs": 4,
|
||||
"tails": 1,
|
||||
@ -79,12 +79,13 @@ var myDog = {
|
||||
};
|
||||
|
||||
// Only change code below this line
|
||||
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myDog = {
|
||||
const myDog = {
|
||||
"name": "Happy Coder",
|
||||
"legs": 4,
|
||||
"tails": 1,
|
||||
|
||||
@ -46,11 +46,11 @@ assert(code.match(/quotient/g).length === 1);
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var quotient = 0.0 / 2.0; // Change this line
|
||||
const quotient = 0.0 / 2.0; // Change this line
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var quotient = 4.4 / 2.0;
|
||||
const quotient = 4.4 / 2.0;
|
||||
```
|
||||
|
||||
@ -16,7 +16,7 @@ JavaScript 中使用 `/` 符號做除法運算。
|
||||
**示例**
|
||||
|
||||
```js
|
||||
myVar = 16 / 2;
|
||||
const myVar = 16 / 2;
|
||||
```
|
||||
|
||||
現在，變量 `myVar` 的值爲 `8`。
|
||||
@ -49,11 +49,11 @@ assert(/\d+\s*\/\s*\d+/.test(code));
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var quotient = 66 / 0;
|
||||
const quotient = 66 / 0;
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var quotient = 66 / 33;
|
||||
const quotient = 66 / 33;
|
||||
```
|
||||
|
||||
@ -89,11 +89,11 @@ console.log('myStr:\n' + myStr);}})();
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var myStr; // Change this line
|
||||
const myStr = ""; // Change this line
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myStr = "FirstLine\n\t\\SecondLine\nThirdLine";
|
||||
const myStr = "FirstLine\n\t\\SecondLine\nThirdLine";
|
||||
```
|
||||
|
||||
@ -14,7 +14,7 @@ dashedName: escaping-literal-quotes-in-strings
|
||||
在 JavaScript 中，可以通過在引號前面使用<dfn>反斜槓</dfn>（`\`）來<dfn>轉義</dfn>引號。
|
||||
|
||||
```js
|
||||
var sampleStr = "Alan said, \"Peter is learning JavaScript\".";
|
||||
const sampleStr = "Alan said, \"Peter is learning JavaScript\".";
|
||||
```
|
||||
|
||||
有了轉義符號，JavaScript 就知道這個單引號或雙引號並不是字符串的結尾，而是字符串內的字符。 所以，上面的字符串打印到控制檯的結果爲：
|
||||
@ -62,11 +62,11 @@ assert(/I am a "double quoted" string inside "double quotes(\."|"\.)$/.test(mySt
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var myStr = ""; // Change this line
|
||||
const myStr = ""; // Change this line
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myStr = "I am a \"double quoted\" string inside \"double quotes\".";
|
||||
const myStr = "I am a \"double quoted\" string inside \"double quotes\".";
|
||||
```
|
||||
|
||||
@ -31,7 +31,7 @@ dashedName: finding-a-remainder-in-javascript
|
||||
變量 `remainder` 應該被初始化。
|
||||
|
||||
```js
|
||||
assert(/var\s+?remainder/.test(code));
|
||||
assert(/(const|let|var)\s+?remainder/.test(code));
|
||||
```
|
||||
|
||||
`remainder` 的值應該等於 `2`。
|
||||
@ -57,13 +57,11 @@ assert(/\s+?remainder\s*?=\s*?.*%.*;?/.test(code));
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
// Only change code below this line
|
||||
|
||||
var remainder;
|
||||
const remainder = 0;
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var remainder = 11 % 3;
|
||||
const remainder = 11 % 3;
|
||||
```
|
||||
|
||||
@ -14,9 +14,10 @@ dashedName: global-vs--local-scope-in-functions
|
||||
下面爲例：
|
||||
|
||||
```js
|
||||
var someVar = "Hat";
|
||||
const someVar = "Hat";
|
||||
|
||||
function myFun() {
|
||||
var someVar = "Head";
|
||||
const someVar = "Head";
|
||||
return someVar;
|
||||
}
|
||||
```
|
||||
@ -53,13 +54,11 @@ assert(/return outerWear/.test(code));
|
||||
|
||||
```js
|
||||
// Setup
|
||||
var outerWear = "T-Shirt";
|
||||
const outerWear = "T-Shirt";
|
||||
|
||||
function myOutfit() {
|
||||
// Only change code below this line
|
||||
|
||||
|
||||
|
||||
// Only change code above this line
|
||||
return outerWear;
|
||||
}
|
||||
@ -70,9 +69,9 @@ myOutfit();
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var outerWear = "T-Shirt";
|
||||
const outerWear = "T-Shirt";
|
||||
function myOutfit() {
|
||||
var outerWear = "sweater";
|
||||
const outerWear = "sweater";
|
||||
return outerWear;
|
||||
}
|
||||
```
|
||||
|
||||
@ -90,7 +90,8 @@ assert(golfScore(5, 9) === 'Go Home!');
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var names = ["Hole-in-one!", "Eagle", "Birdie", "Par", "Bogey", "Double Bogey", "Go Home!"];
|
||||
const names = ["Hole-in-one!", "Eagle", "Birdie", "Par", "Bogey", "Double Bogey", "Go Home!"];
|
||||
|
||||
function golfScore(par, strokes) {
|
||||
// Only change code below this line
|
||||
|
||||
|
||||
@ -39,7 +39,7 @@ assert(myVar === 88);
|
||||
|
||||
```js
|
||||
assert(
|
||||
/var\s*myVar\s*=\s*87;\s*\/*.*\s*([+]{2}\s*myVar|myVar\s*[+]{2});/.test(code)
|
||||
/let\s*myVar\s*=\s*87;\s*\/*.*\s*([+]{2}\s*myVar|myVar\s*[+]{2});/.test(code)
|
||||
);
|
||||
```
|
||||
|
||||
@ -52,7 +52,7 @@ assert(/[+]{2}\s*myVar|myVar\s*[+]{2}/.test(code));
|
||||
不應該修改註釋上面的代碼。
|
||||
|
||||
```js
|
||||
assert(/var myVar = 87;/.test(code));
|
||||
assert(/let myVar = 87;/.test(code));
|
||||
```
|
||||
|
||||
# --seed--
|
||||
@ -66,7 +66,7 @@ assert(/var myVar = 87;/.test(code));
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var myVar = 87;
|
||||
let myVar = 87;
|
||||
|
||||
// Only change code below this line
|
||||
myVar = myVar + 1;
|
||||
@ -75,6 +75,6 @@ myVar = myVar + 1;
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myVar = 87;
|
||||
let myVar = 87;
|
||||
myVar++;
|
||||
```
|
||||
|
||||
@ -64,7 +64,7 @@ assert(testElse(10) === 'Bigger than 5');
|
||||
不要修改相應註釋的上面或下面的代碼。
|
||||
|
||||
```js
|
||||
assert(/var result = "";/.test(code) && /return result;/.test(code));
|
||||
assert(/let result = "";/.test(code) && /return result;/.test(code));
|
||||
```
|
||||
|
||||
# --seed--
|
||||
@ -73,7 +73,7 @@ assert(/var result = "";/.test(code) && /return result;/.test(code));
|
||||
|
||||
```js
|
||||
function testElse(val) {
|
||||
var result = "";
|
||||
let result = "";
|
||||
// Only change code below this line
|
||||
|
||||
if (val > 5) {
|
||||
@ -95,7 +95,7 @@ testElse(4);
|
||||
|
||||
```js
|
||||
function testElse(val) {
|
||||
var result = "";
|
||||
let result = "";
|
||||
if(val > 5) {
|
||||
result = "Bigger than 5";
|
||||
} else {
|
||||
|
||||
@ -12,8 +12,9 @@ dashedName: iterate-through-an-array-with-a-for-loop
|
||||
JavaScript 中的一個常見任務是遍歷數組的內容。 一種方法是使用 `for` 循環。 下面的代碼將輸出數組 `arr` 的每個元素到控制檯：
|
||||
|
||||
```js
|
||||
var arr = [10, 9, 8, 7, 6];
|
||||
for (var i = 0; i < arr.length; i++) {
|
||||
const arr = [10, 9, 8, 7, 6];
|
||||
|
||||
for (let i = 0; i < arr.length; i++) {
|
||||
console.log(arr[i]);
|
||||
}
|
||||
```
|
||||
@ -62,18 +63,19 @@ assert(!__helpers.removeWhiteSpace(code).match(/total[=+-]0*[1-9]+/gm));
|
||||
|
||||
```js
|
||||
// Setup
|
||||
var myArr = [ 2, 3, 4, 5, 6];
|
||||
const myArr = [2, 3, 4, 5, 6];
|
||||
|
||||
// Only change code below this line
|
||||
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myArr = [ 2, 3, 4, 5, 6];
|
||||
var total = 0;
|
||||
const myArr = [2, 3, 4, 5, 6];
|
||||
let total = 0;
|
||||
|
||||
for (var i = 0; i < myArr.length; i++) {
|
||||
for (let i = 0; i < myArr.length; i++) {
|
||||
total += myArr[i];
|
||||
}
|
||||
```
|
||||
|
||||
@ -12,8 +12,9 @@ dashedName: iterate-with-javascript-do---while-loops
|
||||
下一種循環叫作 `do...while` 循環。 它被稱爲 `do...while` 循環，是因爲不論什麼情況，它都會首先 `do`（運行）循環裏的第一部分代碼，然後 `while`（當）規定的條件被評估爲 `true`（真）的時候，它會繼續運行循環。
|
||||
|
||||
```js
|
||||
var ourArray = [];
|
||||
var i = 0;
|
||||
const ourArray = [];
|
||||
let i = 0;
|
||||
|
||||
do {
|
||||
ourArray.push(i);
|
||||
i++;
|
||||
@ -23,8 +24,9 @@ do {
|
||||
上面的示例行爲類似於其他類型的循環，由此產生的數組將看起來像 `[0, 1, 2, 3, 4]`。 然而，`do...while` 不同於其他循環的地方，是第一次循環檢查失敗時的行爲。 讓我們看看代碼中的區別：這裏是一個常規的 `while` 循環，只要 `i < 5`，就會在循環中運行代碼：
|
||||
|
||||
```js
|
||||
var ourArray = [];
|
||||
var i = 5;
|
||||
const ourArray = [];
|
||||
let i = 5;
|
||||
|
||||
while (i < 5) {
|
||||
ourArray.push(i);
|
||||
i++;
|
||||
@ -34,8 +36,9 @@ while (i < 5) {
|
||||
這個例子中，定義了一個空數組 `ourArray` 以及一個值爲 5 的 `i` 。 當執行 `while` 循環時，因爲 `i` 不小於 5，所以循環條件爲 `false`，循環內的代碼將不會執行。 `ourArray` 最終沒有添加任何內容，因此示例中的所有代碼執行完時，ourArray 仍然是`[]`。 現在，看一下 `do...while` 循環。
|
||||
|
||||
```js
|
||||
var ourArray = [];
|
||||
var i = 5;
|
||||
const ourArray = [];
|
||||
let i = 5;
|
||||
|
||||
do {
|
||||
ourArray.push(i);
|
||||
i++;
|
||||
@ -80,8 +83,8 @@ if(typeof myArray !== "undefined"){(function(){return myArray;})();}
|
||||
|
||||
```js
|
||||
// Setup
|
||||
var myArray = [];
|
||||
var i = 10;
|
||||
const myArray = [];
|
||||
let i = 10;
|
||||
|
||||
// Only change code below this line
|
||||
while (i < 5) {
|
||||
@ -93,8 +96,8 @@ while (i < 5) {
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myArray = [];
|
||||
var i = 10;
|
||||
const myArray = [];
|
||||
let i = 10;
|
||||
do {
|
||||
myArray.push(i);
|
||||
i++;
|
||||
|
||||
@ -15,9 +15,10 @@ dashedName: local-scope-and-functions
|
||||
|
||||
```js
|
||||
function myTest() {
|
||||
var loc = "foo";
|
||||
const loc = "foo";
|
||||
console.log(loc);
|
||||
}
|
||||
|
||||
myTest();
|
||||
console.log(loc);
|
||||
```
|
||||
@ -38,6 +39,7 @@ console.log(loc);
|
||||
function declared() {
|
||||
myVar;
|
||||
}
|
||||
|
||||
assert.throws(declared, ReferenceError);
|
||||
```
|
||||
|
||||
@ -57,7 +59,6 @@ assert(
|
||||
|
||||
```js
|
||||
function myLocalScope() {
|
||||
|
||||
// Only change code below this line
|
||||
|
||||
console.log('inside myLocalScope', myVar);
|
||||
@ -73,9 +74,8 @@ console.log('outside myLocalScope', myVar);
|
||||
|
||||
```js
|
||||
function myLocalScope() {
|
||||
|
||||
// Only change code below this line
|
||||
var myVar;
|
||||
let myVar;
|
||||
console.log('inside myLocalScope', myVar);
|
||||
}
|
||||
myLocalScope();
|
||||
|
||||
@ -16,10 +16,10 @@ dashedName: manipulate-arrays-with-push
|
||||
示例：
|
||||
|
||||
```js
|
||||
var arr1 = [1,2,3];
|
||||
const arr1 = [1, 2, 3];
|
||||
arr1.push(4);
|
||||
|
||||
var arr2 = ["Stimpson", "J", "cat"];
|
||||
const arr2 = ["Stimpson", "J", "cat"];
|
||||
arr2.push(["happy", "joy"]);
|
||||
```
|
||||
|
||||
@ -64,14 +64,15 @@ assert(
|
||||
|
||||
```js
|
||||
// Setup
|
||||
var myArray = [["John", 23], ["cat", 2]];
|
||||
const myArray = [["John", 23], ["cat", 2]];
|
||||
|
||||
// Only change code below this line
|
||||
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myArray = [["John", 23], ["cat", 2]];
|
||||
const myArray = [["John", 23], ["cat", 2]];
|
||||
myArray.push(["dog",3]);
|
||||
```
|
||||
|
||||
@ -14,7 +14,7 @@ dashedName: manipulating-complex-objects
|
||||
這是一個複雜數據結構的示例：
|
||||
|
||||
```js
|
||||
var ourMusic = [
|
||||
const ourMusic = [
|
||||
{
|
||||
"artist": "Daft Punk",
|
||||
"title": "Homework",
|
||||
@ -135,7 +135,7 @@ myMusic.forEach(object => {
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var myMusic = [
|
||||
const myMusic = [
|
||||
{
|
||||
"artist": "Billy Joel",
|
||||
"title": "Piano Man",
|
||||
@ -153,7 +153,7 @@ var myMusic = [
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myMusic = [
|
||||
const myMusic = [
|
||||
{
|
||||
"artist": "Billy Joel",
|
||||
"title": "Piano Man",
|
||||
|
||||
@ -12,7 +12,7 @@ dashedName: multiple-identical-options-in-switch-statements
|
||||
如果你忘了給 `switch` 的每一條 `case` 添加 `break`，那麼後續的 `case` 會一直執行，直到遇見 `break` 爲止。 如果你想爲 `switch` 中的多個不同的輸入設置相同的結果，可以這樣寫：
|
||||
|
||||
```js
|
||||
var result = "";
|
||||
let result = "";
|
||||
switch(val) {
|
||||
case 1:
|
||||
case 2:
|
||||
@ -109,7 +109,7 @@ assert(code.match(/case/g).length === 9);
|
||||
|
||||
```js
|
||||
function sequentialSizes(val) {
|
||||
var answer = "";
|
||||
let answer = "";
|
||||
// Only change code below this line
|
||||
|
||||
|
||||
@ -125,7 +125,7 @@ sequentialSizes(1);
|
||||
|
||||
```js
|
||||
function sequentialSizes(val) {
|
||||
var answer = "";
|
||||
let answer = "";
|
||||
|
||||
switch(val) {
|
||||
case 1:
|
||||
|
||||
@ -42,11 +42,11 @@ assert(/\*/.test(code));
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var product = 2.0 * 0.0;
|
||||
const product = 2.0 * 0.0;
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var product = 2.0 * 2.5;
|
||||
const product = 2.0 * 2.5;
|
||||
```
|
||||
|
||||
@ -16,7 +16,7 @@ JavaScript 使用 `*` 符號表示兩數相乘。
|
||||
**示例**
|
||||
|
||||
```js
|
||||
myVar = 13 * 13;
|
||||
const myVar = 13 * 13;
|
||||
```
|
||||
|
||||
現在，變量 `myVar` 的值爲 `169`。
|
||||
@ -50,11 +50,11 @@ assert(/\*/.test(code));
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var product = 8 * 0;
|
||||
const product = 8 * 0;
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var product = 8 * 10;
|
||||
const product = 8 * 10;
|
||||
```
|
||||
|
||||
@ -12,7 +12,7 @@ dashedName: nest-one-array-within-another-array
|
||||
您也可以在其他數組中嵌套數組，如：
|
||||
|
||||
```js
|
||||
[["Bulls", 23], ["White Sox", 45]]
|
||||
const teams = [["Bulls", 23], ["White Sox", 45]];
|
||||
```
|
||||
|
||||
這也叫做多維數組（<dfn>multi-dimensional array</dfn>）。
|
||||
@ -41,11 +41,11 @@ if(typeof myArray !== "undefined"){(function(){return myArray;})();}
|
||||
|
||||
```js
|
||||
// Only change code below this line
|
||||
var myArray = [];
|
||||
const myArray = [];
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myArray = [[1,2,3]];
|
||||
const myArray = [[1, 2, 3]];
|
||||
```
|
||||
|
||||
@ -68,34 +68,33 @@ assert(lookUpProfile('Akira', 'address') === 'No such property');
|
||||
|
||||
```js
|
||||
// Setup
|
||||
var contacts = [
|
||||
{
|
||||
"firstName": "Akira",
|
||||
"lastName": "Laine",
|
||||
"number": "0543236543",
|
||||
"likes": ["Pizza", "Coding", "Brownie Points"]
|
||||
},
|
||||
{
|
||||
"firstName": "Harry",
|
||||
"lastName": "Potter",
|
||||
"number": "0994372684",
|
||||
"likes": ["Hogwarts", "Magic", "Hagrid"]
|
||||
},
|
||||
{
|
||||
"firstName": "Sherlock",
|
||||
"lastName": "Holmes",
|
||||
"number": "0487345643",
|
||||
"likes": ["Intriguing Cases", "Violin"]
|
||||
},
|
||||
{
|
||||
"firstName": "Kristian",
|
||||
"lastName": "Vos",
|
||||
"number": "unknown",
|
||||
"likes": ["JavaScript", "Gaming", "Foxes"]
|
||||
}
|
||||
const contacts = [
|
||||
{
|
||||
firstName: "Akira",
|
||||
lastName: "Laine",
|
||||
number: "0543236543",
|
||||
likes: ["Pizza", "Coding", "Brownie Points"],
|
||||
},
|
||||
{
|
||||
firstName: "Harry",
|
||||
lastName: "Potter",
|
||||
number: "0994372684",
|
||||
likes: ["Hogwarts", "Magic", "Hagrid"],
|
||||
},
|
||||
{
|
||||
firstName: "Sherlock",
|
||||
lastName: "Holmes",
|
||||
number: "0487345643",
|
||||
likes: ["Intriguing Cases", "Violin"],
|
||||
},
|
||||
{
|
||||
firstName: "Kristian",
|
||||
lastName: "Vos",
|
||||
number: "unknown",
|
||||
likes: ["JavaScript", "Gaming", "Foxes"],
|
||||
},
|
||||
];
|
||||
|
||||
|
||||
function lookUpProfile(name, prop) {
|
||||
// Only change code below this line
|
||||
|
||||
@ -108,44 +107,38 @@ lookUpProfile("Akira", "likes");
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var contacts = [
|
||||
{
|
||||
"firstName": "Akira",
|
||||
"lastName": "Laine",
|
||||
"number": "0543236543",
|
||||
"likes": ["Pizza", "Coding", "Brownie Points"]
|
||||
},
|
||||
{
|
||||
"firstName": "Harry",
|
||||
"lastName": "Potter",
|
||||
"number": "0994372684",
|
||||
"likes": ["Hogwarts", "Magic", "Hagrid"]
|
||||
},
|
||||
{
|
||||
"firstName": "Sherlock",
|
||||
"lastName": "Holmes",
|
||||
"number": "0487345643",
|
||||
"likes": ["Intriguing Cases", "Violin"]
|
||||
},
|
||||
{
|
||||
"firstName": "Kristian",
|
||||
"lastName": "Vos",
|
||||
"number": "unknown",
|
||||
"likes": ["JavaScript", "Gaming", "Foxes"]
|
||||
},
|
||||
const contacts = [
|
||||
{
|
||||
firstName: "Akira",
|
||||
lastName: "Laine",
|
||||
number: "0543236543",
|
||||
likes: ["Pizza", "Coding", "Brownie Points"],
|
||||
},
|
||||
{
|
||||
firstName: "Harry",
|
||||
lastName: "Potter",
|
||||
number: "0994372684",
|
||||
likes: ["Hogwarts", "Magic", "Hagrid"],
|
||||
},
|
||||
{
|
||||
firstName: "Sherlock",
|
||||
lastName: "Holmes",
|
||||
number: "0487345643",
|
||||
likes: ["Intriguing Cases", "Violin"],
|
||||
},
|
||||
{
|
||||
firstName: "Kristian",
|
||||
lastName: "Vos",
|
||||
number: "unknown",
|
||||
likes: ["JavaScript", "Gaming", "Foxes"],
|
||||
},
|
||||
];
|
||||
|
||||
|
||||
//Write your function in between these comments
|
||||
function lookUpProfile(name, prop){
|
||||
for(var i in contacts){
|
||||
if(contacts[i].firstName === name) {
|
||||
return contacts[i][prop] || "No such property";
|
||||
}
|
||||
function lookUpProfile(name, prop) {
|
||||
for (let i in contacts) {
|
||||
if (contacts[i].firstName === name) {
|
||||
return contacts[i][prop] || "No such property";
|
||||
}
|
||||
return "No such contact";
|
||||
}
|
||||
return "No such contact";
|
||||
}
|
||||
//Write your function in between these comments
|
||||
|
||||
lookUpProfile("Akira", "likes");
|
||||
```
|
||||
|
||||
@ -12,21 +12,21 @@ dashedName: quoting-strings-with-single-quotes
|
||||
JavaScript 中的<dfn>字符串</dfn>可以使用開始和結束都是同類型的單引號或雙引號表示。 與其他一些編程語言不同的是，單引號和雙引號的功能在 JavaScript 中是相同的。
|
||||
|
||||
```js
|
||||
doubleQuoteStr = "This is a string";
|
||||
singleQuoteStr = 'This is also a string';
|
||||
const doubleQuoteStr = "This is a string";
|
||||
const singleQuoteStr = 'This is also a string';
|
||||
```
|
||||
|
||||
當你需要在一個字符串中使用多個引號的時候，你可以使用單引號包裹雙引號或者相反。 常見的場景比如在字符串中包含對話的句子需要用引號包裹。 另外比如在一個包含有 `<a>` 標籤的字符串中，標籤的屬性值需要用引號包裹。
|
||||
|
||||
```js
|
||||
conversation = 'Finn exclaims to Jake, "Algebraic!"';
|
||||
const conversation = 'Finn exclaims to Jake, "Algebraic!"';
|
||||
```
|
||||
|
||||
然而，如果你需要在其中使用外面的引號，這就成爲一個問題。 記住，一個字符串在開頭和結尾處有相同的引號。 要知道，字符串在開頭和結尾都有相同的引號，如果在中間使用了相同的引號，字符串會提前中止並拋出錯誤。
|
||||
|
||||
```js
|
||||
goodStr = 'Jake asks Finn, "Hey, let\'s go on an adventure?"';
|
||||
badStr = 'Finn responds, "Let's go!"';
|
||||
const goodStr = 'Jake asks Finn, "Hey, let\'s go on an adventure?"';
|
||||
const badStr = 'Finn responds, "Let's go!"';
|
||||
```
|
||||
|
||||
在這裏 `badStr` 會產生一個錯誤。
|
||||
@ -71,11 +71,11 @@ assert(code.match(/"/g).length === 4 && code.match(/'/g).length === 2);
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var myStr = "<a href=\"http://www.example.com\" target=\"_blank\">Link</a>";
|
||||
const myStr = "<a href=\"http://www.example.com\" target=\"_blank\">Link</a>";
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myStr = '<a href="http://www.example.com" target="_blank">Link</a>';
|
||||
const myStr = '<a href="http://www.example.com" target="_blank">Link</a>';
|
||||
```
|
||||
|
||||
@ -115,7 +115,7 @@ const _recordCollection = {
|
||||
|
||||
```js
|
||||
// Setup
|
||||
var recordCollection = {
|
||||
const recordCollection = {
|
||||
2548: {
|
||||
albumTitle: 'Slippery When Wet',
|
||||
artist: 'Bon Jovi',
|
||||
@ -146,7 +146,7 @@ updateRecords(recordCollection, 5439, 'artist', 'ABBA');
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var recordCollection = {
|
||||
const recordCollection = {
|
||||
2548: {
|
||||
albumTitle: 'Slippery When Wet',
|
||||
artist: 'Bon Jovi',
|
||||
|
||||
@ -14,9 +14,9 @@ dashedName: replace-loops-using-recursion
|
||||
|
||||
```js
|
||||
function multiply(arr, n) {
|
||||
var product = 1;
|
||||
for (var i = 0; i < n; i++) {
|
||||
product *= arr[i];
|
||||
let product = 1;
|
||||
for (let i = 0; i < n; i++) {
|
||||
product *= arr[i];
|
||||
}
|
||||
return product;
|
||||
}
|
||||
|
||||
@ -108,7 +108,7 @@ assert(chainToSwitch(156) === '');
|
||||
|
||||
```js
|
||||
function chainToSwitch(val) {
|
||||
var answer = "";
|
||||
let answer = "";
|
||||
// Only change code below this line
|
||||
|
||||
if (val === "bob") {
|
||||
@ -134,7 +134,7 @@ chainToSwitch(7);
|
||||
|
||||
```js
|
||||
function chainToSwitch(val) {
|
||||
var answer = "";
|
||||
let answer = "";
|
||||
|
||||
switch(val) {
|
||||
case "bob":
|
||||
|
||||
@ -17,7 +17,8 @@ dashedName: return-a-value-from-a-function-with-return
|
||||
function plusThree(num) {
|
||||
return num + 3;
|
||||
}
|
||||
var answer = plusThree(5);
|
||||
|
||||
const answer = plusThree(5);
|
||||
```
|
||||
|
||||
`answer` 的值爲 `8`。
|
||||
|
||||
@ -78,7 +78,7 @@ assert(code.match(/break/g).length > 2);
|
||||
|
||||
```js
|
||||
function caseInSwitch(val) {
|
||||
var answer = "";
|
||||
let answer = "";
|
||||
// Only change code below this line
|
||||
|
||||
|
||||
@ -94,7 +94,7 @@ caseInSwitch(1);
|
||||
|
||||
```js
|
||||
function caseInSwitch(val) {
|
||||
var answer = "";
|
||||
let answer = "";
|
||||
|
||||
switch(val) {
|
||||
case 1:
|
||||
|
||||
@ -81,13 +81,13 @@ var hasNumber = false;
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var myList = [];
|
||||
const myList = [];
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myList = [
|
||||
const myList = [
|
||||
["Candy", 10],
|
||||
["Potatoes", 12],
|
||||
["Eggs", 12],
|
||||
|
||||
@ -93,12 +93,10 @@ function nextInLine(arr, item) {
|
||||
|
||||
return item;
|
||||
// Only change code above this line
|
||||
|
||||
|
||||
}
|
||||
|
||||
// Setup
|
||||
var testArr = [1,2,3,4,5];
|
||||
const testArr = [1, 2, 3, 4, 5];
|
||||
|
||||
// Display code
|
||||
console.log("Before: " + JSON.stringify(testArr));
|
||||
@ -109,7 +107,7 @@ console.log("After: " + JSON.stringify(testArr));
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var testArr = [ 1,2,3,4,5];
|
||||
const testArr = [1, 2, 3, 4, 5];
|
||||
|
||||
function nextInLine(arr, item) {
|
||||
arr.push(item);
|
||||
|
||||
@ -14,7 +14,7 @@ dashedName: store-multiple-values-in-one-variable-using-javascript-arrays
|
||||
以左方括號開始定義一個數組，以右方括號結束，裏面每個元素之間用逗號隔開，例如：
|
||||
|
||||
```js
|
||||
var sandwich = ["peanut butter", "jelly", "bread"]
|
||||
const sandwich = ["peanut butter", "jelly", "bread"];
|
||||
```
|
||||
|
||||
# --instructions--
|
||||
@ -53,11 +53,11 @@ assert(typeof myArray[1] !== 'undefined' && typeof myArray[1] == 'number');
|
||||
|
||||
```js
|
||||
// Only change code below this line
|
||||
var myArray = [];
|
||||
const myArray = [];
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myArray = ["The Answer", 42];
|
||||
const myArray = ["The Answer", 42];
|
||||
```
|
||||
|
||||
@ -16,7 +16,7 @@ JavaScript 中使用 `-` 來做減法運算。
|
||||
**示例**
|
||||
|
||||
```js
|
||||
myVar = 12 - 6;
|
||||
const myVar = 12 - 6;
|
||||
```
|
||||
|
||||
現在，變量 `myVar` 的值爲 `6`。
|
||||
@ -49,11 +49,11 @@ assert(/difference=45-33;?/.test(__helpers.removeWhiteSpace(code)));
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var difference = 45 - 0;
|
||||
const difference = 45 - 0;
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var difference = 45 - 33;
|
||||
const difference = 45 - 33;
|
||||
```
|
||||
|
||||
@ -13,10 +13,11 @@ dashedName: testing-objects-for-properties
|
||||
**示例**
|
||||
|
||||
```js
|
||||
var myObj = {
|
||||
const myObj = {
|
||||
top: "hat",
|
||||
bottom: "pants"
|
||||
};
|
||||
|
||||
myObj.hasOwnProperty("top");
|
||||
myObj.hasOwnProperty("middle");
|
||||
```
|
||||
|
||||
@ -14,14 +14,14 @@ dashedName: understand-string-immutability
|
||||
例如，下面的代碼：
|
||||
|
||||
```js
|
||||
var myStr = "Bob";
|
||||
let myStr = "Bob";
|
||||
myStr[0] = "J";
|
||||
```
|
||||
|
||||
是不會把變量 `myStr` 的值改變成 `Job` 的，因爲變量 `myStr` 是不可變的。 注意，這*並不*意味着 `myStr` 永遠不能被改變，只是字符串字面量 <dfn>string literal</dfn> 的各個字符不能被改變。 改變 `myStr` 的唯一方法是重新給它賦一個值，例如：
|
||||
|
||||
```js
|
||||
var myStr = "Bob";
|
||||
let myStr = "Bob";
|
||||
myStr = "Job";
|
||||
```
|
||||
|
||||
@ -55,7 +55,7 @@ assert(/myStr = "Jello World"/.test(code));
|
||||
|
||||
```js
|
||||
// Setup
|
||||
var myStr = "Jello World";
|
||||
let myStr = "Jello World";
|
||||
|
||||
// Only change code below this line
|
||||
myStr[0] = "H"; // Change this line
|
||||
@ -65,6 +65,6 @@ myStr[0] = "H"; // Change this line
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myStr = "Jello World";
|
||||
let myStr = "Jello World";
|
||||
myStr = "Hello World";
|
||||
```
|
||||
|
||||
@ -43,7 +43,6 @@ welcomeToBooleans();
|
||||
|
||||
```js
|
||||
function welcomeToBooleans() {
|
||||
|
||||
// Only change code below this line
|
||||
|
||||
return false; // Change this line
|
||||
|
||||
@ -14,10 +14,12 @@ dashedName: understanding-undefined-value-returned-from-a-function
|
||||
**示例**
|
||||
|
||||
```js
|
||||
var sum = 0;
|
||||
let sum = 0;
|
||||
|
||||
function addSum(num) {
|
||||
sum = sum + num;
|
||||
}
|
||||
|
||||
addSum(3);
|
||||
```
|
||||
|
||||
@ -61,7 +63,7 @@ assert(
|
||||
|
||||
```js
|
||||
// Setup
|
||||
var sum = 0;
|
||||
let sum = 0;
|
||||
|
||||
function addThree() {
|
||||
sum = sum + 3;
|
||||
@ -79,7 +81,7 @@ addFive();
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var sum = 0;
|
||||
let sum = 0;
|
||||
|
||||
function addThree() {
|
||||
sum = sum + 3;
|
||||
|
||||
@ -14,7 +14,7 @@ dashedName: updating-object-properties
|
||||
舉個例子，讓我們看看 `ourDog`：
|
||||
|
||||
```js
|
||||
var ourDog = {
|
||||
const ourDog = {
|
||||
"name": "Camper",
|
||||
"legs": 4,
|
||||
"tails": 1,
|
||||
@ -54,7 +54,7 @@ assert(/"name": "Coder"/.test(code));
|
||||
|
||||
```js
|
||||
// Setup
|
||||
var myDog = {
|
||||
const myDog = {
|
||||
"name": "Coder",
|
||||
"legs": 4,
|
||||
"tails": 1,
|
||||
@ -62,12 +62,13 @@ var myDog = {
|
||||
};
|
||||
|
||||
// Only change code below this line
|
||||
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myDog = {
|
||||
const myDog = {
|
||||
"name": "Coder",
|
||||
"legs": 4,
|
||||
"tails": 1,
|
||||
|
||||
@ -16,8 +16,8 @@ dashedName: use-bracket-notation-to-find-the-nth-character-in-a-string
|
||||
例如：
|
||||
|
||||
```js
|
||||
var firstName = "Ada";
|
||||
var secondLetterOfFirstName = firstName[1];
|
||||
const firstName = "Ada";
|
||||
const secondLetterOfFirstName = firstName[1];
|
||||
```
|
||||
|
||||
`secondLetterOfFirstName` 值應該爲字符串 `d`。
|
||||
@ -54,15 +54,15 @@ assert(code.match(/thirdLetterOfLastName\s*?=\s*?lastName\[.*?\]/));
|
||||
|
||||
```js
|
||||
// Setup
|
||||
var lastName = "Lovelace";
|
||||
const lastName = "Lovelace";
|
||||
|
||||
// Only change code below this line
|
||||
var thirdLetterOfLastName = lastName; // Change this line
|
||||
const thirdLetterOfLastName = lastName; // Change this line
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var lastName = "Lovelace";
|
||||
var thirdLetterOfLastName = lastName[2];
|
||||
const lastName = "Lovelace";
|
||||
const thirdLetterOfLastName = lastName[2];
|
||||
```
|
||||
|
||||
@ -73,7 +73,7 @@ function rangeOfNumbers(startNum, endNum) {
|
||||
if (endNum - startNum === 0) {
|
||||
return [startNum];
|
||||
} else {
|
||||
var numbers = rangeOfNumbers(startNum, endNum - 1);
|
||||
const numbers = rangeOfNumbers(startNum, endNum - 1);
|
||||
numbers.push(endNum);
|
||||
return numbers;
|
||||
}
|
||||
|
||||
@ -20,7 +20,7 @@ parseInt(string, radix);
|
||||
這是一個示例：
|
||||
|
||||
```js
|
||||
var a = parseInt("11", 2);
|
||||
const a = parseInt("11", 2);
|
||||
```
|
||||
|
||||
變量 radix 表示 `11` 是在二進制系統中。 這個示例將字符串 `11` 轉換爲整數 `3`。
|
||||
|
||||
@ -12,7 +12,7 @@ dashedName: use-the-parseint-function
|
||||
`parseInt()` 函數解析一個字符串返回一個整數。 下面是一個示例：
|
||||
|
||||
```js
|
||||
var a = parseInt("007");
|
||||
const a = parseInt("007");
|
||||
```
|
||||
|
||||
上述函數將字符串 `007` 轉換爲整數 `7`。 如果字符串中的第一個字符不能轉換爲數字，則返回 `NaN`。
|
||||
|
||||
@ -14,7 +14,7 @@ dashedName: using-objects-for-lookups
|
||||
這是簡單的反向字母表：
|
||||
|
||||
```js
|
||||
var alpha = {
|
||||
const alpha = {
|
||||
1:"Z",
|
||||
2:"Y",
|
||||
3:"X",
|
||||
@ -24,10 +24,11 @@ var alpha = {
|
||||
25:"B",
|
||||
26:"A"
|
||||
};
|
||||
|
||||
alpha[2];
|
||||
alpha[24];
|
||||
|
||||
var value = 2;
|
||||
const value = 2;
|
||||
alpha[value];
|
||||
```
|
||||
|
||||
@ -102,7 +103,7 @@ assert(
|
||||
```js
|
||||
// Setup
|
||||
function phoneticLookup(val) {
|
||||
var result = "";
|
||||
let result = "";
|
||||
|
||||
// Only change code below this line
|
||||
switch(val) {
|
||||
@ -136,9 +137,9 @@ phoneticLookup("charlie");
|
||||
|
||||
```js
|
||||
function phoneticLookup(val) {
|
||||
var result = "";
|
||||
let result = "";
|
||||
|
||||
var lookup = {
|
||||
const lookup = {
|
||||
alpha: "Adams",
|
||||
bravo: "Boston",
|
||||
charlie: "Chicago",
|
||||
|
||||
@ -16,7 +16,7 @@ dashedName: word-blanks
|
||||
思考一下這句話 - It was really **\_\_\_\_**, and we **\_\_\_\_** ourselves **\_\_\_\_**。 這句話有三個缺失的部分 - 形容詞、動詞和副詞，選擇合適單詞填入完成它。 然後將完成的句子賦值給變量，如下所示：
|
||||
|
||||
```js
|
||||
var sentence = "It was really " + "hot" + ", and we " + "laughed" + " ourselves " + "silly" + ".";
|
||||
const sentence = "It was really " + "hot" + ", and we " + "laughed" + " ourselves " + "silly" + ".";
|
||||
```
|
||||
|
||||
# --instructions--
|
||||
@ -84,24 +84,24 @@ const removeAssignments = str => str
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var myNoun = "dog";
|
||||
var myAdjective = "big";
|
||||
var myVerb = "ran";
|
||||
var myAdverb = "quickly";
|
||||
const myNoun = "dog";
|
||||
const myAdjective = "big";
|
||||
const myVerb = "ran";
|
||||
const myAdverb = "quickly";
|
||||
|
||||
// Only change code below this line
|
||||
var wordBlanks = ""; // Change this line
|
||||
const wordBlanks = ""; // Change this line
|
||||
// Only change code above this line
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myNoun = "dog";
|
||||
var myAdjective = "big";
|
||||
var myVerb = "ran";
|
||||
var myAdverb = "quickly";
|
||||
const myNoun = "dog";
|
||||
const myAdjective = "big";
|
||||
const myVerb = "ran";
|
||||
const myAdverb = "quickly";
|
||||
|
||||
var wordBlanks = "Once there was a " + myNoun + " which was very " + myAdjective + ". ";
|
||||
let wordBlanks = "Once there was a " + myNoun + " which was very " + myAdjective + ". ";
|
||||
wordBlanks += "It " + myVerb + " " + myAdverb + " around the yard.";
|
||||
```
|
||||
|
||||
@ -13,7 +13,7 @@ dashedName: add-elements-to-the-end-of-an-array-using-concat-instead-of-push
|
||||
上一個挑戰介紹了 `concat` 方法，這是一種在不改變原始數組的前提下，將數組組合成新數組的方法。 將 `concat` 方法與 `push` 方法做比較。 `push` 將元素添加到調用它的數組的末尾，這樣會改變該數組。 舉個例子：
|
||||
|
||||
```js
|
||||
var arr = [1, 2, 3];
|
||||
const arr = [1, 2, 3];
|
||||
arr.push([4, 5, 6]);
|
||||
```
|
||||
|
||||
@ -71,8 +71,9 @@ function nonMutatingPush(original, newItem) {
|
||||
|
||||
// Only change code above this line
|
||||
}
|
||||
var first = [1, 2, 3];
|
||||
var second = [4, 5];
|
||||
|
||||
const first = [1, 2, 3];
|
||||
const second = [4, 5];
|
||||
nonMutatingPush(first, second);
|
||||
```
|
||||
|
||||
@ -82,7 +83,6 @@ nonMutatingPush(first, second);
|
||||
function nonMutatingPush(original, newItem) {
|
||||
return original.concat(newItem);
|
||||
}
|
||||
var first = [1, 2, 3];
|
||||
var second = [4, 5];
|
||||
nonMutatingPush(first, second);
|
||||
const first = [1, 2, 3];
|
||||
const second = [4, 5];
|
||||
```
|
||||
|
||||
@ -77,7 +77,6 @@ function urlSlug(title) {
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
// Only change code below this line
|
||||
function urlSlug(title) {
|
||||
return title.trim().split(/\s+/).join("-").toLowerCase();
|
||||
}
|
||||
|
||||
@ -57,9 +57,9 @@ assert(__newValue === 5);
|
||||
|
||||
```js
|
||||
// The global variable
|
||||
var fixedValue = 4;
|
||||
let fixedValue = 4;
|
||||
|
||||
function incrementer () {
|
||||
function incrementer() {
|
||||
// Only change code below this line
|
||||
|
||||
|
||||
@ -70,7 +70,7 @@ function incrementer () {
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var fixedValue = 4
|
||||
let fixedValue = 4
|
||||
|
||||
function incrementer() {
|
||||
return fixedValue + 1
|
||||
|
||||
@ -13,8 +13,8 @@ dashedName: combine-an-array-into-a-string-using-the-join-method
|
||||
舉個例子：
|
||||
|
||||
```js
|
||||
var arr = ["Hello", "World"];
|
||||
var str = arr.join(" ");
|
||||
const arr = ["Hello", "World"];
|
||||
const str = arr.join(" ");
|
||||
```
|
||||
|
||||
`str` 的值應該是字符串 `Hello World`。
|
||||
@ -76,6 +76,7 @@ function sentensify(str) {
|
||||
|
||||
// Only change code above this line
|
||||
}
|
||||
|
||||
sentensify("May-the-force-be-with-you");
|
||||
```
|
||||
|
||||
@ -83,8 +84,6 @@ sentensify("May-the-force-be-with-you");
|
||||
|
||||
```js
|
||||
function sentensify(str) {
|
||||
// Only change code below this line
|
||||
return str.split(/\W/).join(' ');
|
||||
// Only change code above this line
|
||||
}
|
||||
```
|
||||
|
||||
@ -60,8 +60,9 @@ function nonMutatingConcat(original, attach) {
|
||||
|
||||
// Only change code above this line
|
||||
}
|
||||
var first = [1, 2, 3];
|
||||
var second = [4, 5];
|
||||
|
||||
const first = [1, 2, 3];
|
||||
const second = [4, 5];
|
||||
nonMutatingConcat(first, second);
|
||||
```
|
||||
|
||||
@ -69,11 +70,8 @@ nonMutatingConcat(first, second);
|
||||
|
||||
```js
|
||||
function nonMutatingConcat(original, attach) {
|
||||
// Only change code below this line
|
||||
return original.concat(attach);
|
||||
// Only change code above this line
|
||||
}
|
||||
var first = [1, 2, 3];
|
||||
var second = [4, 5];
|
||||
nonMutatingConcat(first, second);
|
||||
const first = [1, 2, 3];
|
||||
const second = [4, 5];
|
||||
```
|
||||
|
||||
@ -38,17 +38,17 @@ assert(!code.match(/\.?[\s\S]*?map/g));
|
||||
|
||||
```js
|
||||
// The global variable
|
||||
var s = [23, 65, 98, 5];
|
||||
const s = [23, 65, 98, 5];
|
||||
|
||||
Array.prototype.myMap = function(callback) {
|
||||
var newArray = [];
|
||||
const newArray = [];
|
||||
// Only change code below this line
|
||||
|
||||
// Only change code above this line
|
||||
return newArray;
|
||||
};
|
||||
|
||||
var new_s = s.myMap(function(item) {
|
||||
const new_s = s.myMap(function(item) {
|
||||
return item * 2;
|
||||
});
|
||||
```
|
||||
@ -56,20 +56,17 @@ var new_s = s.myMap(function(item) {
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
// the global Array
|
||||
var s = [23, 65, 98, 5];
|
||||
const s = [23, 65, 98, 5];
|
||||
|
||||
Array.prototype.myMap = function(callback) {
|
||||
var newArray = [];
|
||||
// Only change code below this line
|
||||
for (var elem of this) {
|
||||
const newArray = [];
|
||||
for (const elem of this) {
|
||||
newArray.push(callback(elem));
|
||||
}
|
||||
// Only change code above this line
|
||||
return newArray;
|
||||
};
|
||||
|
||||
var new_s = s.myMap(function(item) {
|
||||
const new_s = s.myMap(function(item) {
|
||||
return item * 2;
|
||||
});
|
||||
```
|
||||
|
||||
@ -34,16 +34,16 @@ assert(!code.match(/\.?[\s\S]*?filter/g));
|
||||
|
||||
```js
|
||||
// The global variable
|
||||
var s = [23, 65, 98, 5];
|
||||
const s = [23, 65, 98, 5];
|
||||
|
||||
Array.prototype.myFilter = function(callback) {
|
||||
// Only change code below this line
|
||||
var newArray = [];
|
||||
const newArray = [];
|
||||
// Only change code above this line
|
||||
return newArray;
|
||||
};
|
||||
|
||||
var new_s = s.myFilter(function(item) {
|
||||
const new_s = s.myFilter(function(item) {
|
||||
return item % 2 === 1;
|
||||
});
|
||||
```
|
||||
@ -51,20 +51,17 @@ var new_s = s.myFilter(function(item) {
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
// the global Array
|
||||
var s = [23, 65, 98, 5];
|
||||
const s = [23, 65, 98, 5];
|
||||
|
||||
Array.prototype.myFilter = function(callback) {
|
||||
var newArray = [];
|
||||
// Only change code below this line
|
||||
const newArray = [];
|
||||
for (let i = 0; i < this.length; i++) {
|
||||
if (callback(this[i])) newArray.push(this[i]);
|
||||
}
|
||||
// Only change code above this line
|
||||
return newArray;
|
||||
};
|
||||
|
||||
var new_s = s.myFilter(function(item) {
|
||||
const new_s = s.myFilter(function(item) {
|
||||
return item % 2 === 1;
|
||||
});
|
||||
```
|
||||
|
||||
@ -35,7 +35,7 @@ curried(1)(2)
|
||||
柯里化在不能一次爲函數提供所有參數情況下很有用。 因爲它可以將每個函數的調用保存到一個變量中，該變量將保存返回的函數引用，該引用在下一個參數可用時接受該參數。 下面是使用柯里化函數的例子：
|
||||
|
||||
```js
|
||||
var funcForY = curried(1);
|
||||
const funcForY = curried(1);
|
||||
console.log(funcForY(2)); // 3
|
||||
```
|
||||
|
||||
@ -45,7 +45,8 @@ console.log(funcForY(2)); // 3
|
||||
function impartial(x, y, z) {
|
||||
return x + y + z;
|
||||
}
|
||||
var partialFn = impartial.bind(this, 1, 2);
|
||||
|
||||
const partialFn = impartial.bind(this, 1, 2);
|
||||
partialFn(10); // 13
|
||||
```
|
||||
|
||||
@ -90,6 +91,7 @@ function add(x) {
|
||||
|
||||
// Only change code above this line
|
||||
}
|
||||
|
||||
add(10)(20)(30);
|
||||
```
|
||||
|
||||
|
||||
@ -53,10 +53,10 @@ assert(__newValue === 5);
|
||||
|
||||
```js
|
||||
// The global variable
|
||||
var fixedValue = 4;
|
||||
let fixedValue = 4;
|
||||
|
||||
// Only change code below this line
|
||||
function incrementer () {
|
||||
function incrementer() {
|
||||
|
||||
|
||||
// Only change code above this line
|
||||
@ -66,15 +66,9 @@ function incrementer () {
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
// The global variable
|
||||
var fixedValue = 4;
|
||||
let fixedValue = 4;
|
||||
|
||||
// Only change code below this line
|
||||
function incrementer (fixedValue) {
|
||||
function incrementer(fixedValue) {
|
||||
return fixedValue + 1;
|
||||
|
||||
// Only change code above this line
|
||||
}
|
||||
|
||||
|
||||
```
|
||||
|
||||
@ -11,7 +11,7 @@ dashedName: remove-elements-from-an-array-using-slice-instead-of-splice
|
||||
使用數組時經常遇到要刪除一些元素並保留數組剩餘部分的情況。 爲此，JavaScript 提供了 `splice` 方法，它接收兩個參數：從哪裏開始刪除項目的索引，和要刪除的項目數。 如果沒有提供第二個參數，默認情況下是移除一直到結尾的所有元素。 但 `splice` 方法會改變調用它的原始數組。 舉個例子：
|
||||
|
||||
```js
|
||||
var cities = ["Chicago", "Delhi", "Islamabad", "London", "Berlin"];
|
||||
const cities = ["Chicago", "Delhi", "Islamabad", "London", "Berlin"];
|
||||
cities.splice(3, 1);
|
||||
```
|
||||
|
||||
@ -69,7 +69,8 @@ function nonMutatingSplice(cities) {
|
||||
|
||||
// Only change code above this line
|
||||
}
|
||||
var inputCities = ["Chicago", "Delhi", "Islamabad", "London", "Berlin"];
|
||||
|
||||
const inputCities = ["Chicago", "Delhi", "Islamabad", "London", "Berlin"];
|
||||
nonMutatingSplice(inputCities);
|
||||
```
|
||||
|
||||
@ -77,10 +78,7 @@ nonMutatingSplice(inputCities);
|
||||
|
||||
```js
|
||||
function nonMutatingSplice(cities) {
|
||||
// Only change code below this line
|
||||
return cities.slice(0,3);
|
||||
// Only change code above this line
|
||||
}
|
||||
var inputCities = ["Chicago", "Delhi", "Islamabad", "London", "Berlin"];
|
||||
nonMutatingSplice(inputCities);
|
||||
const inputCities = ["Chicago", "Delhi", "Islamabad", "London", "Berlin"];
|
||||
```
|
||||
|
||||
@ -68,24 +68,23 @@ assert(JSON.stringify(nonMutatingSort([140000, 104, 99])) ===
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var globalArray = [5, 6, 3, 2, 9];
|
||||
const globalArray = [5, 6, 3, 2, 9];
|
||||
|
||||
function nonMutatingSort(arr) {
|
||||
// Only change code below this line
|
||||
|
||||
|
||||
// Only change code above this line
|
||||
}
|
||||
|
||||
nonMutatingSort(globalArray);
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var globalArray = [5, 6, 3, 2, 9];
|
||||
const globalArray = [5, 6, 3, 2, 9];
|
||||
function nonMutatingSort(arr) {
|
||||
// Only change code below this line
|
||||
return [].concat(arr).sort((a,b) => a-b);
|
||||
// Only change code above this line
|
||||
}
|
||||
nonMutatingSort(globalArray);
|
||||
```
|
||||
|
||||
@ -13,8 +13,8 @@ dashedName: return-part-of-an-array-using-the-slice-method
|
||||
舉個例子：
|
||||
|
||||
```js
|
||||
var arr = ["Cat", "Dog", "Tiger", "Zebra"];
|
||||
var newArray = arr.slice(1, 3);
|
||||
const arr = ["Cat", "Dog", "Tiger", "Zebra"];
|
||||
const newArray = arr.slice(1, 3);
|
||||
```
|
||||
|
||||
`newArray` 值爲 `["Dog", "Tiger"]`
|
||||
@ -78,7 +78,8 @@ function sliceArray(anim, beginSlice, endSlice) {
|
||||
|
||||
// Only change code above this line
|
||||
}
|
||||
var inputAnim = ["Cat", "Dog", "Tiger", "Zebra", "Ant"];
|
||||
|
||||
const inputAnim = ["Cat", "Dog", "Tiger", "Zebra", "Ant"];
|
||||
sliceArray(inputAnim, 1, 3);
|
||||
```
|
||||
|
||||
@ -86,10 +87,7 @@ sliceArray(inputAnim, 1, 3);
|
||||
|
||||
```js
|
||||
function sliceArray(anim, beginSlice, endSlice) {
|
||||
// Only change code below this line
|
||||
return anim.slice(beginSlice, endSlice)
|
||||
// Only change code above this line
|
||||
return anim.slice(beginSlice, endSlice);
|
||||
}
|
||||
var inputAnim = ["Cat", "Dog", "Tiger", "Zebra", "Ant"];
|
||||
sliceArray(inputAnim, 1, 3);
|
||||
const inputAnim = ["Cat", "Dog", "Tiger", "Zebra", "Ant"];
|
||||
```
|
||||
|
||||
@ -18,6 +18,7 @@ function ascendingOrder(arr) {
|
||||
return a - b;
|
||||
});
|
||||
}
|
||||
|
||||
ascendingOrder([1, 5, 2, 3, 4]);
|
||||
```
|
||||
|
||||
@ -29,6 +30,7 @@ function reverseAlpha(arr) {
|
||||
return a === b ? 0 : a < b ? 1 : -1;
|
||||
});
|
||||
}
|
||||
|
||||
reverseAlpha(['l', 'h', 'z', 'b', 's']);
|
||||
```
|
||||
|
||||
@ -86,6 +88,7 @@ function alphabeticalOrder(arr) {
|
||||
return arr
|
||||
// Only change code above this line
|
||||
}
|
||||
|
||||
alphabeticalOrder(["a", "d", "c", "a", "z", "g"]);
|
||||
```
|
||||
|
||||
@ -93,9 +96,6 @@ alphabeticalOrder(["a", "d", "c", "a", "z", "g"]);
|
||||
|
||||
```js
|
||||
function alphabeticalOrder(arr) {
|
||||
// Only change code below this line
|
||||
return arr.sort();
|
||||
// Only change code above this line
|
||||
}
|
||||
alphabeticalOrder(["a", "d", "c", "a", "z", "g"]);
|
||||
```
|
||||
|
||||
@ -13,11 +13,11 @@ dashedName: split-a-string-into-an-array-using-the-split-method
|
||||
下面是兩個用空格分隔一個字符串的例子，另一個是用數字的正則表達式分隔：
|
||||
|
||||
```js
|
||||
var str = "Hello World";
|
||||
var bySpace = str.split(" ");
|
||||
const str = "Hello World";
|
||||
const bySpace = str.split(" ");
|
||||
|
||||
var otherString = "How9are7you2today";
|
||||
var byDigits = otherString.split(/\d/);
|
||||
const otherString = "How9are7you2today";
|
||||
const byDigits = otherString.split(/\d/);
|
||||
```
|
||||
|
||||
`bySpace` 將有值 `["Hello", "World"]`，`byDigits` 將有值 `["How", "are", "you", "today"]`。
|
||||
@ -74,6 +74,7 @@ function splitify(str) {
|
||||
|
||||
// Only change code above this line
|
||||
}
|
||||
|
||||
splitify("Hello World,I-am code");
|
||||
```
|
||||
|
||||
@ -81,8 +82,6 @@ splitify("Hello World,I-am code");
|
||||
|
||||
```js
|
||||
function splitify(str) {
|
||||
// Only change code below this line
|
||||
return str.split(/\W/);
|
||||
// Only change code above this line
|
||||
}
|
||||
```
|
||||
|
||||
@ -59,29 +59,29 @@ assert.deepEqual(finalTabs.tabs, [
|
||||
|
||||
```js
|
||||
// tabs is an array of titles of each site open within the window
|
||||
var Window = function(tabs) {
|
||||
const Window = function(tabs) {
|
||||
this.tabs = tabs; // We keep a record of the array inside the object
|
||||
};
|
||||
|
||||
// When you join two windows into one window
|
||||
Window.prototype.join = function (otherWindow) {
|
||||
Window.prototype.join = function(otherWindow) {
|
||||
this.tabs = this.tabs.concat(otherWindow.tabs);
|
||||
return this;
|
||||
};
|
||||
|
||||
// When you open a new tab at the end
|
||||
Window.prototype.tabOpen = function (tab) {
|
||||
Window.prototype.tabOpen = function(tab) {
|
||||
this.tabs.push('new tab'); // Let's open a new tab for now
|
||||
return this;
|
||||
};
|
||||
|
||||
// When you close a tab
|
||||
Window.prototype.tabClose = function (index) {
|
||||
Window.prototype.tabClose = function(index) {
|
||||
|
||||
// Only change code below this line
|
||||
|
||||
var tabsBeforeIndex = this.tabs.splice(0, index); // Get the tabs before the tab
|
||||
var tabsAfterIndex = this.tabs.splice(index + 1); // Get the tabs after the tab
|
||||
const tabsBeforeIndex = this.tabs.splice(0, index); // Get the tabs before the tab
|
||||
const tabsAfterIndex = this.tabs.splice(index + 1); // Get the tabs after the tab
|
||||
|
||||
this.tabs = tabsBeforeIndex.concat(tabsAfterIndex); // Join them together
|
||||
|
||||
@ -91,12 +91,12 @@ Window.prototype.tabClose = function (index) {
|
||||
};
|
||||
|
||||
// Let's create three browser windows
|
||||
var workWindow = new Window(['GMail', 'Inbox', 'Work mail', 'Docs', 'freeCodeCamp']); // Your mailbox, drive, and other work sites
|
||||
var socialWindow = new Window(['FB', 'Gitter', 'Reddit', 'Twitter', 'Medium']); // Social sites
|
||||
var videoWindow = new Window(['Netflix', 'YouTube', 'Vimeo', 'Vine']); // Entertainment sites
|
||||
const workWindow = new Window(['GMail', 'Inbox', 'Work mail', 'Docs', 'freeCodeCamp']); // Your mailbox, drive, and other work sites
|
||||
const socialWindow = new Window(['FB', 'Gitter', 'Reddit', 'Twitter', 'Medium']); // Social sites
|
||||
const videoWindow = new Window(['Netflix', 'YouTube', 'Vimeo', 'Vine']); // Entertainment sites
|
||||
|
||||
// Now perform the tab opening, closing, and other operations
|
||||
var finalTabs = socialWindow
|
||||
const finalTabs = socialWindow
|
||||
.tabOpen() // Open a new tab for cat memes
|
||||
.join(videoWindow.tabClose(2)) // Close third tab in video window, and join
|
||||
.join(workWindow.tabClose(1).tabOpen());
|
||||
@ -106,40 +106,34 @@ console.log(finalTabs.tabs);
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
// tabs is an array of titles of each site open within the window
|
||||
var Window = function(tabs) {
|
||||
this.tabs = tabs; // We keep a record of the array inside the object
|
||||
const Window = function(tabs) {
|
||||
this.tabs = tabs;
|
||||
};
|
||||
|
||||
// When you join two windows into one window
|
||||
Window.prototype.join = function (otherWindow) {
|
||||
Window.prototype.join = function(otherWindow) {
|
||||
this.tabs = this.tabs.concat(otherWindow.tabs);
|
||||
return this;
|
||||
};
|
||||
|
||||
// When you open a new tab at the end
|
||||
Window.prototype.tabOpen = function (tab) {
|
||||
this.tabs.push('new tab'); // Let's open a new tab for now
|
||||
Window.prototype.tabOpen = function(tab) {
|
||||
this.tabs.push('new tab');
|
||||
return this;
|
||||
};
|
||||
|
||||
// When you close a tab
|
||||
Window.prototype.tabClose = function (index) {
|
||||
var tabsBeforeIndex = this.tabs.slice(0, index); // Get the tabs before the tab
|
||||
var tabsAfterIndex = this.tabs.slice(index + 1); // Get the tabs after the tab
|
||||
Window.prototype.tabClose = function(index) {
|
||||
const tabsBeforeIndex = this.tabs.slice(0, index);
|
||||
const tabsAfterIndex = this.tabs.slice(index + 1);
|
||||
|
||||
this.tabs = tabsBeforeIndex.concat(tabsAfterIndex); // Join them together
|
||||
this.tabs = tabsBeforeIndex.concat(tabsAfterIndex);
|
||||
return this;
|
||||
};
|
||||
|
||||
// Let's create three browser windows
|
||||
var workWindow = new Window(['GMail', 'Inbox', 'Work mail', 'Docs', 'freeCodeCamp']); // Your mailbox, drive, and other work sites
|
||||
var socialWindow = new Window(['FB', 'Gitter', 'Reddit', 'Twitter', 'Medium']); // Social sites
|
||||
var videoWindow = new Window(['Netflix', 'YouTube', 'Vimeo', 'Vine']); // Entertainment sites
|
||||
const workWindow = new Window(['GMail', 'Inbox', 'Work mail', 'Docs', 'freeCodeCamp']);
|
||||
const socialWindow = new Window(['FB', 'Gitter', 'Reddit', 'Twitter', 'Medium']);
|
||||
const videoWindow = new Window(['Netflix', 'YouTube', 'Vimeo', 'Vine']);
|
||||
|
||||
// Now perform the tab opening, closing, and other operations
|
||||
var finalTabs = socialWindow
|
||||
.tabOpen() // Open a new tab for cat memes
|
||||
.join(videoWindow.tabClose(2)) // Close third tab in video window, and join
|
||||
const finalTabs = socialWindow
|
||||
.tabOpen()
|
||||
.join(videoWindow.tabClose(2))
|
||||
.join(workWindow.tabClose(1).tabOpen());
|
||||
```
|
||||
|
||||
@ -13,7 +13,8 @@ dashedName: use-the-every-method-to-check-that-every-element-in-an-array-meets-a
|
||||
舉個例子，下面的代碼檢測數組 `numbers` 的所有元素是否都小於 10：
|
||||
|
||||
```js
|
||||
var numbers = [1, 5, 8, 0, 10, 11];
|
||||
const numbers = [1, 5, 8, 0, 10, 11];
|
||||
|
||||
numbers.every(function(currentValue) {
|
||||
return currentValue < 10;
|
||||
});
|
||||
@ -62,6 +63,7 @@ function checkPositive(arr) {
|
||||
|
||||
// Only change code above this line
|
||||
}
|
||||
|
||||
checkPositive([1, 2, 3, -4, 5]);
|
||||
```
|
||||
|
||||
@ -69,9 +71,6 @@ checkPositive([1, 2, 3, -4, 5]);
|
||||
|
||||
```js
|
||||
function checkPositive(arr) {
|
||||
// Only change code below this line
|
||||
return arr.every(num => num > 0);
|
||||
// Only change code above this line
|
||||
}
|
||||
checkPositive([1, 2, 3, -4, 5]);
|
||||
```
|
||||
|
||||
@ -93,7 +93,7 @@ assert(getRating(watchList.filter((_, i) => i < 1 || i > 2)) === 8.55);
|
||||
|
||||
```js
|
||||
// The global variable
|
||||
var watchList = [
|
||||
const watchList = [
|
||||
{
|
||||
"Title": "Inception",
|
||||
"Year": "2010",
|
||||
@ -206,22 +206,22 @@ var watchList = [
|
||||
}
|
||||
];
|
||||
|
||||
function getRating(watchList){
|
||||
function getRating(watchList) {
|
||||
// Only change code below this line
|
||||
var averageRating;
|
||||
let averageRating;
|
||||
|
||||
|
||||
// Only change code above this line
|
||||
return averageRating;
|
||||
}
|
||||
|
||||
console.log(getRating(watchList));
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
// The global variable
|
||||
var watchList = [
|
||||
const watchList = [
|
||||
{
|
||||
"Title": "Inception",
|
||||
"Year": "2010",
|
||||
@ -334,8 +334,8 @@ var watchList = [
|
||||
}
|
||||
];
|
||||
|
||||
function getRating(watchList){
|
||||
var averageRating;
|
||||
function getRating(watchList) {
|
||||
let averageRating;
|
||||
const rating = watchList
|
||||
.filter(obj => obj.Director === "Christopher Nolan")
|
||||
.map(obj => Number(obj.imdbRating));
|
||||
|
||||
@ -13,7 +13,8 @@ dashedName: use-the-some-method-to-check-that-any-elements-in-an-array-meet-a-cr
|
||||
舉個例子，下面的代碼檢測數組`numbers`中是否有元素小於 10：
|
||||
|
||||
```js
|
||||
var numbers = [10, 50, 8, 220, 110, 11];
|
||||
const numbers = [10, 50, 8, 220, 110, 11];
|
||||
|
||||
numbers.some(function(currentValue) {
|
||||
return currentValue < 10;
|
||||
});
|
||||
@ -62,6 +63,7 @@ function checkPositive(arr) {
|
||||
|
||||
// Only change code above this line
|
||||
}
|
||||
|
||||
checkPositive([1, 2, 3, -4, 5]);
|
||||
```
|
||||
|
||||
@ -69,9 +71,6 @@ checkPositive([1, 2, 3, -4, 5]);
|
||||
|
||||
```js
|
||||
function checkPositive(arr) {
|
||||
// Only change code below this line
|
||||
return arr.some(elem => elem > 0);
|
||||
// Only change code above this line
|
||||
}
|
||||
checkPositive([1, 2, 3, -4, 5]);
|
||||
```
|
||||
|
||||
@ -157,7 +157,7 @@ assert(diffArray([1, 'calf', 3, 'piglet'], [7, 'filly']).length === 6);
|
||||
|
||||
```js
|
||||
function diffArray(arr1, arr2) {
|
||||
var newArr = [];
|
||||
const newArr = [];
|
||||
return newArr;
|
||||
}
|
||||
|
||||
@ -168,13 +168,12 @@ diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5]);
|
||||
|
||||
```js
|
||||
function diffArray(arr1, arr2) {
|
||||
var newArr = [];
|
||||
var h1 = Object.create(null);
|
||||
const newArr = [];
|
||||
const h1 = Object.create(null);
|
||||
arr1.forEach(function(e) {
|
||||
h1[e] = e;
|
||||
});
|
||||
|
||||
var h2 = Object.create(null);
|
||||
const h2 = Object.create(null);
|
||||
arr2.forEach(function(e) {
|
||||
h2[e] = e;
|
||||
});
|
||||
|
||||
@ -148,7 +148,7 @@ if(bob){
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var Person = function(firstAndLast) {
|
||||
const Person = function(firstAndLast) {
|
||||
// Only change code below this line
|
||||
// Complete the method below and implement the others similarly
|
||||
this.getFullName = function() {
|
||||
@ -157,16 +157,16 @@ var Person = function(firstAndLast) {
|
||||
return firstAndLast;
|
||||
};
|
||||
|
||||
var bob = new Person('Bob Ross');
|
||||
const bob = new Person('Bob Ross');
|
||||
bob.getFullName();
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var Person = function(firstAndLast) {
|
||||
const Person = function(firstAndLast) {
|
||||
|
||||
var firstName, lastName;
|
||||
let firstName, lastName;
|
||||
|
||||
function updateName(str) {
|
||||
firstName = str.split(" ")[0];
|
||||
@ -201,6 +201,6 @@ var Person = function(firstAndLast) {
|
||||
};
|
||||
};
|
||||
|
||||
var bob = new Person('Bob Ross');
|
||||
const bob = new Person('Bob Ross');
|
||||
bob.getFullName();
|
||||
```
|
||||
|
||||
@ -51,8 +51,8 @@ assert.deepEqual(
|
||||
|
||||
```js
|
||||
function orbitalPeriod(arr) {
|
||||
var GM = 398600.4418;
|
||||
var earthRadius = 6367.4447;
|
||||
const GM = 398600.4418;
|
||||
const earthRadius = 6367.4447;
|
||||
return arr;
|
||||
}
|
||||
|
||||
@ -63,9 +63,9 @@ orbitalPeriod([{name : "sputnik", avgAlt : 35873.5553}]);
|
||||
|
||||
```js
|
||||
function orbitalPeriod(arr) {
|
||||
var GM = 398600.4418;
|
||||
var earthRadius = 6367.4447;
|
||||
var TAU = 2 * Math.PI;
|
||||
const GM = 398600.4418;
|
||||
const earthRadius = 6367.4447;
|
||||
const TAU = 2 * Math.PI;
|
||||
return arr.map(function(obj) {
|
||||
return {
|
||||
name: obj.name,
|
||||
@ -73,6 +73,4 @@ function orbitalPeriod(arr) {
|
||||
};
|
||||
});
|
||||
}
|
||||
|
||||
orbitalPeriod([{name : "sputkin", avgAlt : 35873.5553}]);
|
||||
```
|
||||
|
||||
@ -61,7 +61,6 @@ function smallestCommons(arr) {
|
||||
return arr;
|
||||
}
|
||||
|
||||
|
||||
smallestCommons([1,5]);
|
||||
```
|
||||
|
||||
|
||||
@ -103,7 +103,7 @@ assert.deepEqual(
|
||||
|
||||
```js
|
||||
function whatIsInAName(collection, source) {
|
||||
var arr = [];
|
||||
const arr = [];
|
||||
// Only change code below this line
|
||||
|
||||
|
||||
@ -118,8 +118,8 @@ whatIsInAName([{ first: "Romeo", last: "Montague" }, { first: "Mercutio", last:
|
||||
|
||||
```js
|
||||
function whatIsInAName(collection, source) {
|
||||
var arr = [];
|
||||
var keys = Object.keys(source);
|
||||
const arr = [];
|
||||
const keys = Object.keys(source);
|
||||
collection.forEach(function(e) {
|
||||
if(keys.every(function(key) {return e[key] === source[key];})) {
|
||||
arr.push(e);
|
||||
|
||||
@ -51,7 +51,6 @@ assert(
|
||||
|
||||
```js
|
||||
function rot13(str) {
|
||||
|
||||
return str;
|
||||
}
|
||||
|
||||
|
||||
@ -186,7 +186,7 @@ assert.deepEqual(
|
||||
|
||||
```js
|
||||
function checkCashRegister(price, cash, cid) {
|
||||
var change;
|
||||
let change;
|
||||
return change;
|
||||
}
|
||||
|
||||
@ -196,54 +196,57 @@ checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], [
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var denom = [
|
||||
{ name: 'ONE HUNDRED', val: 100},
|
||||
{ name: 'TWENTY', val: 20},
|
||||
{ name: 'TEN', val: 10},
|
||||
{ name: 'FIVE', val: 5},
|
||||
{ name: 'ONE', val: 1},
|
||||
{ name: 'QUARTER', val: 0.25},
|
||||
{ name: 'DIME', val: 0.1},
|
||||
{ name: 'NICKEL', val: 0.05},
|
||||
{ name: 'PENNY', val: 0.01}
|
||||
const denom = [
|
||||
{ name: "ONE HUNDRED", val: 100 },
|
||||
{ name: "TWENTY", val: 20 },
|
||||
{ name: "TEN", val: 10 },
|
||||
{ name: "FIVE", val: 5 },
|
||||
{ name: "ONE", val: 1 },
|
||||
{ name: "QUARTER", val: 0.25 },
|
||||
{ name: "DIME", val: 0.1 },
|
||||
{ name: "NICKEL", val: 0.05 },
|
||||
{ name: "PENNY", val: 0.01 },
|
||||
];
|
||||
|
||||
function checkCashRegister(price, cash, cid) {
|
||||
var output = {status: null, change: []};
|
||||
var change = cash - price;
|
||||
var register = cid.reduce(function(acc, curr) {
|
||||
acc.total += curr[1];
|
||||
acc[curr[0]] = curr[1];
|
||||
return acc;
|
||||
}, {total: 0});
|
||||
if(register.total === change) {
|
||||
output.status = 'CLOSED';
|
||||
output.change = cid;
|
||||
return output;
|
||||
}
|
||||
if(register.total < change) {
|
||||
output.status = 'INSUFFICIENT_FUNDS';
|
||||
return output;
|
||||
}
|
||||
var change_arr = denom.reduce(function(acc, curr) {
|
||||
var value = 0;
|
||||
while(register[curr.name] > 0 && change >= curr.val) {
|
||||
change -= curr.val;
|
||||
register[curr.name] -= curr.val;
|
||||
value += curr.val;
|
||||
change = Math.round(change * 100) / 100;
|
||||
}
|
||||
if(value > 0) {
|
||||
acc.push([ curr.name, value ]);
|
||||
}
|
||||
return acc;
|
||||
}, []);
|
||||
if(change_arr.length < 1 || change > 0) {
|
||||
output.status = 'INSUFFICIENT_FUNDS';
|
||||
return output;
|
||||
}
|
||||
output.status = 'OPEN';
|
||||
output.change = change_arr;
|
||||
return output;
|
||||
const output = { status: null, change: [] };
|
||||
let change = cash - price;
|
||||
const register = cid.reduce(
|
||||
function (acc, curr) {
|
||||
acc.total += curr[1];
|
||||
acc[curr[0]] = curr[1];
|
||||
return acc;
|
||||
},
|
||||
{ total: 0 }
|
||||
);
|
||||
if (register.total === change) {
|
||||
output.status = "CLOSED";
|
||||
output.change = cid;
|
||||
return output;
|
||||
}
|
||||
if (register.total < change) {
|
||||
output.status = "INSUFFICIENT_FUNDS";
|
||||
return output;
|
||||
}
|
||||
const change_arr = denom.reduce(function (acc, curr) {
|
||||
let value = 0;
|
||||
while (register[curr.name] > 0 && change >= curr.val) {
|
||||
change -= curr.val;
|
||||
register[curr.name] -= curr.val;
|
||||
value += curr.val;
|
||||
change = Math.round(change * 100) / 100;
|
||||
}
|
||||
if (value > 0) {
|
||||
acc.push([curr.name, value]);
|
||||
}
|
||||
return acc;
|
||||
}, []);
|
||||
if (change_arr.length < 1 || change > 0) {
|
||||
output.status = "INSUFFICIENT_FUNDS";
|
||||
return output;
|
||||
}
|
||||
output.status = "OPEN";
|
||||
output.change = change_arr;
|
||||
return output;
|
||||
}
|
||||
```
|
||||
|
||||
@ -107,8 +107,6 @@ function palindrome(str) {
|
||||
return true;
|
||||
}
|
||||
|
||||
|
||||
|
||||
palindrome("eye");
|
||||
```
|
||||
|
||||
|
||||
@ -18,9 +18,9 @@ dashedName: access-array-data-with-indexes
|
||||
**示例**
|
||||
|
||||
```js
|
||||
var array = [50,60,70];
|
||||
const array = [50, 60, 70];
|
||||
array[0];
|
||||
var data = array[1];
|
||||
const data = array[1];
|
||||
```
|
||||
|
||||
现在 `array[0]` 的值是 `50`， `data` 的值为 `60`.
|
||||
@ -76,7 +76,7 @@ if(typeof myArray !== "undefined" && typeof myData !== "undefined"){(function(y,
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var myArray = [50,60,70];
|
||||
const myArray = [50, 60, 70];
|
||||
|
||||
|
||||
```
|
||||
@ -84,6 +84,6 @@ var myArray = [50,60,70];
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myArray = [50,60,70];
|
||||
var myData = myArray[0];
|
||||
const myArray = [50, 60, 70];
|
||||
const myData = myArray[0];
|
||||
```
|
||||
|
||||
@ -14,12 +14,13 @@ dashedName: access-multi-dimensional-arrays-with-indexes
|
||||
**例如：**
|
||||
|
||||
```js
|
||||
var arr = [
|
||||
[1,2,3],
|
||||
[4,5,6],
|
||||
[7,8,9],
|
||||
[[10,11,12], 13, 14]
|
||||
const arr = [
|
||||
[1, 2, 3],
|
||||
[4, 5, 6],
|
||||
[7, 8, 9],
|
||||
[[10, 11, 12], 13, 14]
|
||||
];
|
||||
|
||||
arr[3];
|
||||
arr[3][0];
|
||||
arr[3][0][1];
|
||||
@ -58,14 +59,19 @@ if(typeof myArray !== "undefined"){(function(){return "myData: " + myData + " my
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var myArray = [[1,2,3], [4,5,6], [7,8,9], [[10,11,12], 13, 14]];
|
||||
const myArray = [
|
||||
[1, 2, 3],
|
||||
[4, 5, 6],
|
||||
[7, 8, 9],
|
||||
[[10, 11, 12], 13, 14],
|
||||
];
|
||||
|
||||
var myData = myArray[0][0];
|
||||
const myData = myArray[0][0];
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myArray = [[1,2,3],[4,5,6], [7,8,9], [[10,11,12], 13, 14]];
|
||||
var myData = myArray[2][1];
|
||||
const myArray = [[1, 2, 3], [4, 5, 6], [7, 8, 9], [[10, 11, 12], 13, 14]];
|
||||
const myData = myArray[2][1];
|
||||
```
|
||||
|
||||
@ -14,7 +14,7 @@ dashedName: accessing-nested-arrays
|
||||
下面是访问嵌套数组的例子：
|
||||
|
||||
```js
|
||||
var ourPets = [
|
||||
const ourPets = [
|
||||
{
|
||||
animalType: "cat",
|
||||
names: [
|
||||
@ -32,6 +32,7 @@ var ourPets = [
|
||||
]
|
||||
}
|
||||
];
|
||||
|
||||
ourPets[0].names[1];
|
||||
ourPets[1].names[0];
|
||||
```
|
||||
@ -72,7 +73,7 @@ assert(/=\s*myPlants\[1\].list\[1\]/.test(code));
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var myPlants = [
|
||||
const myPlants = [
|
||||
{
|
||||
type: "flowers",
|
||||
list: [
|
||||
@ -91,13 +92,13 @@ var myPlants = [
|
||||
}
|
||||
];
|
||||
|
||||
var secondTree = "";
|
||||
const secondTree = "";
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myPlants = [
|
||||
const myPlants = [
|
||||
{
|
||||
type: "flowers",
|
||||
list: [
|
||||
@ -116,5 +117,5 @@ var myPlants = [
|
||||
}
|
||||
];
|
||||
|
||||
var secondTree = myPlants[1].list[1];
|
||||
const secondTree = myPlants[1].list[1];
|
||||
```
|
||||
|
||||
@ -14,7 +14,7 @@ dashedName: accessing-nested-objects
|
||||
这是一个嵌套对象：
|
||||
|
||||
```js
|
||||
var ourStorage = {
|
||||
const ourStorage = {
|
||||
"desk": {
|
||||
"drawer": "stapler"
|
||||
},
|
||||
@ -26,6 +26,7 @@ var ourStorage = {
|
||||
"bottom drawer": "soda"
|
||||
}
|
||||
};
|
||||
|
||||
ourStorage.cabinet["top drawer"].folder2;
|
||||
ourStorage.desk.drawer;
|
||||
```
|
||||
@ -66,7 +67,7 @@ assert(/=\s*myStorage\.car\.inside\[\s*("|')glove box\1\s*\]/g.test(code));
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var myStorage = {
|
||||
const myStorage = {
|
||||
"car": {
|
||||
"inside": {
|
||||
"glove box": "maps",
|
||||
@ -78,13 +79,13 @@ var myStorage = {
|
||||
}
|
||||
};
|
||||
|
||||
var gloveBoxContents = undefined;
|
||||
const gloveBoxContents = undefined;
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myStorage = {
|
||||
const myStorage = {
|
||||
"car":{
|
||||
"inside":{
|
||||
"glove box":"maps",
|
||||
@ -95,5 +96,5 @@ var myStorage = {
|
||||
}
|
||||
}
|
||||
};
|
||||
var gloveBoxContents = myStorage.car.inside["glove box"];
|
||||
const gloveBoxContents = myStorage.car.inside["glove box"];
|
||||
```
|
||||
|
||||
@ -16,11 +16,12 @@ dashedName: accessing-object-properties-with-bracket-notation
|
||||
这是一个使用方括号表示法读取对象属性的例子：
|
||||
|
||||
```js
|
||||
var myObj = {
|
||||
const myObj = {
|
||||
"Space Name": "Kirk",
|
||||
"More Space": "Spock",
|
||||
"NoSpace": "USS Enterprise"
|
||||
};
|
||||
|
||||
myObj["Space Name"];
|
||||
myObj['More Space'];
|
||||
myObj["NoSpace"];
|
||||
@ -78,26 +79,25 @@ assert(code.match(/testObj\s*?\[('|")[^'"]+\1\]/g).length > 1);
|
||||
|
||||
```js
|
||||
// Setup
|
||||
var testObj = {
|
||||
const testObj = {
|
||||
"an entree": "hamburger",
|
||||
"my side": "veggies",
|
||||
"the drink": "water"
|
||||
};
|
||||
|
||||
// Only change code below this line
|
||||
|
||||
var entreeValue = testObj; // Change this line
|
||||
var drinkValue = testObj; // Change this line
|
||||
const entreeValue = testObj; // Change this line
|
||||
const drinkValue = testObj; // Change this line
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var testObj = {
|
||||
const testObj = {
|
||||
"an entree": "hamburger",
|
||||
"my side": "veggies",
|
||||
"the drink": "water"
|
||||
};
|
||||
var entreeValue = testObj["an entree"];
|
||||
var drinkValue = testObj['the drink'];
|
||||
const entreeValue = testObj["an entree"];
|
||||
const drinkValue = testObj['the drink'];
|
||||
```
|
||||
|
||||
@ -16,15 +16,17 @@ dashedName: accessing-object-properties-with-dot-notation
|
||||
这里是一个用点符号（`.`）读取对象属性的示例：
|
||||
|
||||
```js
|
||||
var myObj = {
|
||||
const myObj = {
|
||||
prop1: "val1",
|
||||
prop2: "val2"
|
||||
};
|
||||
var prop1val = myObj.prop1;
|
||||
var prop2val = myObj.prop2;
|
||||
|
||||
const prop1val = myObj.prop1;
|
||||
const prop2val = myObj.prop2;
|
||||
```
|
||||
|
||||
`prop1val` 的值将为字符串 `val1`，并且`prop2val` 的值将为字符串 `val2`。
|
||||
|
||||
# --instructions--
|
||||
|
||||
使用点号读取 `testObj` 的属性值。 将变量 `hatValue` 的值设置为该对象的 `hat` 属性的值，并将变量 `shirtValue` 的值设置为该对象的 `shirt` 属性的值。
|
||||
@ -73,27 +75,26 @@ assert(code.match(/testObj\.\w+/g).length > 1);
|
||||
|
||||
```js
|
||||
// Setup
|
||||
var testObj = {
|
||||
const testObj = {
|
||||
"hat": "ballcap",
|
||||
"shirt": "jersey",
|
||||
"shoes": "cleats"
|
||||
};
|
||||
|
||||
// Only change code below this line
|
||||
|
||||
var hatValue = testObj; // Change this line
|
||||
var shirtValue = testObj; // Change this line
|
||||
const hatValue = testObj; // Change this line
|
||||
const shirtValue = testObj; // Change this line
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var testObj = {
|
||||
const testObj = {
|
||||
"hat": "ballcap",
|
||||
"shirt": "jersey",
|
||||
"shoes": "cleats"
|
||||
};
|
||||
|
||||
var hatValue = testObj.hat;
|
||||
var shirtValue = testObj.shirt;
|
||||
const hatValue = testObj.hat;
|
||||
const shirtValue = testObj.shirt;
|
||||
```
|
||||
|
||||
@ -14,11 +14,14 @@ dashedName: accessing-object-properties-with-variables
|
||||
以下是一个使用变量来访问属性的例子：
|
||||
|
||||
```js
|
||||
var dogs = {
|
||||
Fido: "Mutt", Hunter: "Doberman", Snoopie: "Beagle"
|
||||
const dogs = {
|
||||
Fido: "Mutt",
|
||||
Hunter: "Doberman",
|
||||
Snoopie: "Beagle"
|
||||
};
|
||||
var myDog = "Hunter";
|
||||
var myBreed = dogs[myDog];
|
||||
|
||||
const myDog = "Hunter";
|
||||
const myBreed = dogs[myDog];
|
||||
console.log(myBreed);
|
||||
```
|
||||
|
||||
@ -27,14 +30,16 @@ console.log(myBreed);
|
||||
使用这一概念的另一种情况是：属性的名字是在程序运行期间动态收集得到的。如下所示：
|
||||
|
||||
```js
|
||||
var someObj = {
|
||||
const someObj = {
|
||||
propName: "John"
|
||||
};
|
||||
|
||||
function propPrefix(str) {
|
||||
var s = "prop";
|
||||
const s = "prop";
|
||||
return s + str;
|
||||
}
|
||||
var someProp = propPrefix("Name");
|
||||
|
||||
const someProp = propPrefix("Name");
|
||||
console.log(someObj[someProp]);
|
||||
```
|
||||
|
||||
@ -96,26 +101,25 @@ if(typeof player !== "undefined"){(function(v){return v;})(player);}
|
||||
|
||||
```js
|
||||
// Setup
|
||||
var testObj = {
|
||||
const testObj = {
|
||||
12: "Namath",
|
||||
16: "Montana",
|
||||
19: "Unitas"
|
||||
};
|
||||
|
||||
// Only change code below this line
|
||||
|
||||
var playerNumber; // Change this line
|
||||
var player = testObj; // Change this line
|
||||
const playerNumber = 42; // Change this line
|
||||
const player = testObj; // Change this line
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var testObj = {
|
||||
const testObj = {
|
||||
12: "Namath",
|
||||
16: "Montana",
|
||||
19: "Unitas"
|
||||
};
|
||||
var playerNumber = 16;
|
||||
var player = testObj[playerNumber];
|
||||
const playerNumber = 16;
|
||||
const player = testObj[playerNumber];
|
||||
```
|
||||
|
||||
@ -28,7 +28,7 @@ ourDog["bark"] = "bow-wow";
|
||||
例如：
|
||||
|
||||
```js
|
||||
var ourDog = {
|
||||
const ourDog = {
|
||||
"name": "Camper",
|
||||
"legs": 4,
|
||||
"tails": 1,
|
||||
@ -67,7 +67,7 @@ assert(!/bark[^\n]:/.test(code));
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var myDog = {
|
||||
const myDog = {
|
||||
"name": "Happy Coder",
|
||||
"legs": 4,
|
||||
"tails": 1,
|
||||
@ -80,7 +80,7 @@ var myDog = {
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var myDog = {
|
||||
const myDog = {
|
||||
"name": "Happy Coder",
|
||||
"legs": 4,
|
||||
"tails": 1,
|
||||
|
||||
@ -18,7 +18,7 @@ JavaScript 中，我们通过符号 `+` 来进行加法运算。
|
||||
**代码示例:**
|
||||
|
||||
```js
|
||||
myVar = 5 + 10;
|
||||
const myVar = 5 + 10;
|
||||
```
|
||||
|
||||
现在，变量 `myVar` 的值为 `15`。
|
||||
@ -52,11 +52,11 @@ assert(/\+/.test(code));
|
||||
## --seed-contents--
|
||||
|
||||
```js
|
||||
var sum = 10 + 0;
|
||||
const sum = 10 + 0;
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var sum = 10 + 10;
|
||||
const sum = 10 + 10;
|
||||
```
|
||||
|
||||
@ -92,7 +92,7 @@ assert(code.match(/break/g).length > 2);
|
||||
|
||||
```js
|
||||
function switchOfStuff(val) {
|
||||
var answer = "";
|
||||
let answer = "";
|
||||
// Only change code below this line
|
||||
|
||||
|
||||
@ -108,7 +108,7 @@ switchOfStuff(1);
|
||||
|
||||
```js
|
||||
function switchOfStuff(val) {
|
||||
var answer = "";
|
||||
let answer = "";
|
||||
|
||||
switch(val) {
|
||||
case "a":
|
||||
|
||||
@ -14,8 +14,8 @@ dashedName: appending-variables-to-strings
|
||||
示例：
|
||||
|
||||
```js
|
||||
var anAdjective = "awesome!";
|
||||
var ourStr = "freeCodeCamp is ";
|
||||
const anAdjective = "awesome!";
|
||||
let ourStr = "freeCodeCamp is ";
|
||||
ourStr += anAdjective;
|
||||
```
|
||||
|
||||
@ -64,15 +64,14 @@ assert(code.match(/myStr\s*\+=\s*someAdjective\s*/).length > 0);
|
||||
|
||||
```js
|
||||
// Change code below this line
|
||||
|
||||
var someAdjective;
|
||||
var myStr = "Learning to code is ";
|
||||
const someAdjective = "";
|
||||
let myStr = "Learning to code is ";
|
||||
```
|
||||
|
||||
# --solutions--
|
||||
|
||||
```js
|
||||
var someAdjective = "neat";
|
||||
var myStr = "Learning to code is ";
|
||||
const someAdjective = "neat";
|
||||
let myStr = "Learning to code is ";
|
||||
myStr += someAdjective;
|
||||
```
|
||||
|
||||
Some files were not shown because too many files have changed in this diff Show More
Reference in New Issue
Block a user