chore(i18n,curriculum): update translations

curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/functional-programming/add-elements-to-the-end-of-an-array-using-concat-instead-of-push.md

@@ -13,7 +13,7 @@ dashedName: add-elements-to-the-end-of-an-array-using-concat-instead-of-push
 上一个挑战介绍了 `concat` 方法，这是一种在不改变原始数组的前提下，将数组组合成新数组的方法。 将 `concat` 方法与 `push` 方法做比较。 `push` 将元素添加到调用它的数组的末尾，这样会改变该数组。 举个例子：
 
 ```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];
 ```

curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/functional-programming/apply-functional-programming-to-convert-strings-to-url-slugs.md

@@ -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();
 }

curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/functional-programming/avoid-mutations-and-side-effects-using-functional-programming.md

@@ -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

curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/functional-programming/combine-an-array-into-a-string-using-the-join-method.md

@@ -13,8 +13,8 @@ dashedName: combine-an-array-into-a-string-using-the-join-method
 举个例子：
 
 ```js
-var arr = ["Hello", "World"];
-var str = arr.join(" ");
+const arr = ["Hello", "World"];
+const str = arr.join(" ");
 ```
 
 `str` 的值应该是字符串 `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
 }
 ```

curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/functional-programming/combine-two-arrays-using-the-concat-method.md

@@ -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];
 ```

curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/functional-programming/implement-map-on-a-prototype.md

@@ -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;
 });
 ```

curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/functional-programming/implement-the-filter-method-on-a-prototype.md

@@ -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;
 });
 ```

curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/functional-programming/introduction-to-currying-and-partial-application.md

@@ -35,7 +35,7 @@ curried(1)(2)
 柯里化在不能一次为函数提供所有参数情况下很有用。 因为它可以将每个函数的调用保存到一个变量中，该变量将保存返回的函数引用，该引用在下一个参数可用时接受该参数。 下面是使用柯里化函数的例子：
 
 ```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);
 ```
 

curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/functional-programming/pass-arguments-to-avoid-external-dependence-in-a-function.md

@@ -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
 }
-
-
 ```

curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/functional-programming/remove-elements-from-an-array-using-slice-instead-of-splice.md

@@ -11,7 +11,7 @@ dashedName: remove-elements-from-an-array-using-slice-instead-of-splice
 使用数组时经常遇到要删除一些元素并保留数组剩余部分的情况。 为此，JavaScript 提供了 `splice` 方法，它接收两个参数：从哪里开始删除项目的索引，和要删除的项目数。 如果没有提供第二个参数，默认情况下是移除一直到结尾的所有元素。 但 `splice` 方法会改变调用它的原始数组。 举个例子：
 
 ```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"];
 ```

curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/functional-programming/return-a-sorted-array-without-changing-the-original-array.md

@@ -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);
 ```

curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/functional-programming/return-part-of-an-array-using-the-slice-method.md

@@ -13,8 +13,8 @@ dashedName: return-part-of-an-array-using-the-slice-method
 举个例子：
 
 ```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` 值为 `["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"];
 ```

curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/functional-programming/sort-an-array-alphabetically-using-the-sort-method.md

@@ -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"]);
 ```

curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/functional-programming/split-a-string-into-an-array-using-the-split-method.md

@@ -13,11 +13,11 @@ dashedName: split-a-string-into-an-array-using-the-split-method
 下面是两个用空格分隔一个字符串的例子，另一个是用数字的正则表达式分隔：
 
 ```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` 将有值 `["Hello", "World"]`，`byDigits` 将有值 `["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
 }
 ```

curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/functional-programming/understand-the-hazards-of-using-imperative-code.md

@@ -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());
 ```

curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/functional-programming/use-the-every-method-to-check-that-every-element-in-an-array-meets-a-criteria.md

@@ -13,7 +13,8 @@ dashedName: use-the-every-method-to-check-that-every-element-in-an-array-meets-a
 举个例子，下面的代码检测数组 `numbers` 的所有元素是否都小于 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]);
 ```

curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/functional-programming/use-the-reduce-method-to-analyze-data.md

@@ -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));

curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/functional-programming/use-the-some-method-to-check-that-any-elements-in-an-array-meet-a-criteria.md

@@ -13,7 +13,8 @@ dashedName: use-the-some-method-to-check-that-any-elements-in-an-array-meet-a-cr
 举个例子，下面的代码检测数组`numbers`中是否有元素小于 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]);
 ```