More Challenges
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SaintPeter
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@ -2118,27 +2118,52 @@
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},
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{
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"id": "56533eb9ac21ba0edf2244c6",
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"title": "Checkpoint: Functions",
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"title": "Stand in Line",
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"description": [
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"Note: Function Length tips - 10-20 lines, etc",
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"\"Queue\"",
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"myFunction(arr, item)",
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"",
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"Push item on end of array",
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"pop item off front",
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""
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"In Computer Science a <dfn>queue</dfn> is an abastract datatype where items are kept in order. New items can be added to the back of the <code>queue</code> and old items are taken off the front of the <code>queue</code>.",
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"Write a function <code>queue</code> which takes an array and an item as arguments. Add the item onto the end of the array, then remove and return the item at the front of the queue."
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],
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"releasedOn": "11/27/2015",
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"tests": [
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"assert(1===1, 'message: message here');"
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"assert(queue([],1) === 1, 'message: <code>queue([], 1)</code> should return <code>1</code>');",
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"assert(queue([2],1) === 2, 'message: <code>queue([2], 1)</code> should return <code>2</code>');",
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"queue(myArr, 10); assert(myArr[4] === 10, 'message: After <code>queue(myArr, 10)</code>, <code>myArr[4]</code> should be <code>10</code>');"
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],
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"head": [
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"var logOutput = [];",
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"var oldLog = console.log;",
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"function capture() {",
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" console.log = function (message) {",
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" logOutput.push(message);",
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" oldLog.apply(console, arguments);",
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" };",
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"}",
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"",
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"function uncapture() {",
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" console.log = oldLog;",
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"}",
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"",
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"capture();"
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],
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"challengeSeed": [
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"// Setup",
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"var myArr = [1,2,3,4,5];",
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"",
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"function queue(arr, item) {",
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" // Your code here",
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" ",
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" return item; // Change this line",
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"}",
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"",
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""
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"// Display Code",
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"console.log(\"Before: \" + JSON.stringify(myArr));",
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"console.log(queue(myArr, 6)); // Modify this line to test",
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"console.log(\"After: \" + JSON.stringify(myArr));"
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],
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"tail": [
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""
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"uncapture();",
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"myArr = [1,2,3,4,5];",
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"(function() { return logOutput.join(\"\\n\");})();"
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],
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"solutions": [
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"var arr = [ 1,2,3,4,5];",
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@ -2148,8 +2173,8 @@
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" return myArr.shift();",
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"}"
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],
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"type": "waypoint",
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"challengeType": "1",
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"type": "bonfire",
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"challengeType": "5",
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"nameCn": "",
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"nameFr": "",
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"nameRu": "",
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@ -3231,16 +3256,31 @@
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"title": "Returning Boolean Values from Functions",
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"description": [
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"You may recall from <a href=\"challenges/waypoint-comparison-with-the-equality-operator\">Comparison with the Equality Operator</a> that all comparison operators return a boolean <code>true</code> or <code>false</code> value.",
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"A common <dfn>anti-pattern</dfn> is to use an <code>if/else</code> statement to do a comparison and then <code>return</code> <code>true</code>/<code>false</code>."
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"A common <dfn>anti-pattern</dfn> is to use an <code>if/else</code> statement to do a comparison and then <code>return</code> <code>true</code>/<code>false</code>:",
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"<blockquote>function isEqual(a,b) {<br /> if(a === b) {<br /> return true;<br/> } else {<br /> return false;<br/> }<br />}</blockquote>",
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"Since <code>===</code> returns <code>true</code> or <code>false</code>, we can simply return the result of the comparion:",
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"<blockquote>function isEqual(a,b) {<br /> return a === b;<br />}</blockquote>",
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"<h4>Instructions</h4>",
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"Fix the function <code>isLess</code> to remove the <code>if/else</code> statements."
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],
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"releasedOn": "11/27/2015",
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"tests": [
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"assert(1===1, 'message: message here');"
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"assert(isLess(10,15) === true, 'message: <code>isLess(10,15)</code> should return <code>true</code>');",
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"assert(isLess(15, 10) === false, 'message: <code>isLess(15,10)</code> should return <code>true</code>');",
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"assert(!/if|else/g.test(editor.getValue()), 'message: You should not use any <code>if</code> or <code>else</code> statements');"
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],
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"challengeSeed": [
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"function isLess(a, b) {",
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" // Fix this code",
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" if(a < b) {",
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" return true;",
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" } else {",
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" return false;",
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" }",
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"}",
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"",
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"",
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""
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"// Change these values to test",
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"isLess(10, 15);"
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],
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"tail": [
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""
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@ -3260,7 +3300,7 @@
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"id": "56533eb9ac21ba0edf2244c4",
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"title": "Return Early Pattern for Functions",
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"description": [
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"Explain how to use return early for functions"
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"When a <code>return</code> statement is reached, the execution of the current function stops at that point. "
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],
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"releasedOn": "11/27/2015",
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"tests": [
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@ -3829,6 +3869,58 @@
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"nameEs": "",
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"namePt": ""
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},
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{
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"id": "567af2437cbaa8c51670a16c",
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"title": "Testing Objects for Properties",
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"description": [
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"Sometimes it is useful to check of the property of a given object exists or not. We can use the <code>.hasOwnProperty([propname])</code> method of objects to determine if that object has the given property name. <code>.hasOwnProperty()</code> returns <code>true</code> or <code>false</code> if the property is found or not.",
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"Example:",
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"<blockquote>var myObj = {<br /> top: \"hat\",<br /> bottom: \"pants\"<br />};<br />myObj.hasOwnProperty(\"hat\"); // true<br />myObj.hasOwnProperty(\"middle\"); // false</blockquote>",
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"<h4>Instructions</h4>",
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" Modify function <code>checkObj</code> to test <code>myObj</code> for <code>checkProp</code>. If the property is found, return that property's value. If not return <code>\"Not Found\"</code>."
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],
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"tests": [
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"assert(checkObj(\"gift\") === \"pony\", 'message: <code>checkObj(\"gift\")</code> should return <code>\"pony\"</code>.');",
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"assert(checkObj(\"pet\") === \"kitten\", 'message: <code>checkObj(\"gift\")</code> should return <code>\"kitten\"</code>.');",
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"assert(checkObj(\"house\") === \"Not Found\", 'message: <code>checkObj(\"house\")</code> should return <code>\"Not Found\"</code>.');"
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],
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"challengeSeed": [
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"// Setup",
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"var myObj = {",
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" gift: \"pony\",",
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" pet: \"kitten\",",
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" bed: \"sleigh\"",
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"};",
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"",
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"function checkObj(checkProp) {",
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" // Your Code Here",
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"",
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" return \"Change Me!\";",
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"}",
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"",
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"// Test your code by modifying these values",
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"checkObj(\"gift\");"
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],
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"tail": [
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""
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],
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"solutions": [
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"var myObj = {",
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" gift: \"pony\",",
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" pet: \"kitten\",",
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" bed: \"sleigh\"",
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"};",
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"function checkObj(checkProp) {",
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" if(myObj.hasOwnProperty(checkProp)) {",
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" return myObj[checkProp];",
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" } else {",
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" return \"Not Found\";",
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" }",
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"}"
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],
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"type": "waypoint",
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"challengeType": "1"
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},
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{
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"id": "56533eb9ac21ba0edf2244cb",
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"title": "Introducing JavaScript Object Notation (JSON)",
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@ -4022,9 +4114,9 @@
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},
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{
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"id": "56533eb9ac21ba0edf2244ce",
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"title": "Arbitrary Nesting in JSON",
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"title": "Modifying JSON Values",
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"description": [
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"Retrieve a value from an arbitary JSON"
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"Modify the contents of a JSON object"
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],
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"releasedOn": "11/27/2015",
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"tests": [
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@ -4035,6 +4127,9 @@
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"",
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""
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],
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"tail": [
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""
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],
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"solutions": [
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""
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],
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@ -4328,24 +4423,35 @@
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},
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{
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"id": "56533eb9ac21ba0edf2244e2",
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"title": "Checkpoint: Conditionals and Loops",
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"title": "Caesar's Cipher",
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"description": [
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""
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"One of the simplest and most widely known <dfn>ciphers</dfn> is a <code>Caesar cipher</code>, also known as a <code>shift cipher</code>. In a <code>shift cipher</code> the meanings of the letters are shifted by some set amount. ",
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"A common modern use is a <a href=\"https://en.wikipedia.org/wiki/ROT13\">ROT13</a> cipher, where the values of the letters are shifted by 13 places. Thus A = N, B = O and so on.",
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"Write a function which takes a <code>ROT13</code> encoded array of characters as input and returns a plain text encoded array. All letters will be uppercase. Do not transform any non-alphabetic character (IE: spaces, punctiation)."
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],
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"releasedOn": "11/27/2015",
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"tests": [
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"assert(1===1, 'message: message here');"
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"assert( rot13([ 'S', 'E', 'R', 'R', ' ', 'P', 'B', 'Q', 'R', ' ', 'P', 'N', 'Z', 'C' ]).join(\"\") === \"FREE CODE CAMP\", 'message: <code>rot13([ 'S', 'E', 'R', 'R', ' ', 'P', 'B', 'Q', 'R', ' ', 'P', 'N', 'Z', 'C' ])</code> should decode to <code>[ 'F', 'R', 'E', 'E', ' ', 'C', 'O', 'D', 'E', ' ', 'C', 'A', 'M', 'P' ]</code>');",
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"assert(1===1, 'message: blah');"
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],
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"challengeSeed": [
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"function rot13(codeArr) {",
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" // Your Code Here",
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"",
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" return []; // Change this Line",
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"}",
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"",
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"// Change the inputs below to test",
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"rot13([ 'S', 'E', 'R', 'R', ' ', 'P', 'B', 'Q', 'R', ' ', 'P', 'N', 'Z', 'C' ]);"
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],
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"tail": [
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""
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],
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"solutions": [
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""
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],
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"type": "waypoint",
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"challengeType": "1",
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"type": "bonfire",
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"challengeType": "5",
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"nameCn": "",
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"nameFr": "",
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"nameRu": "",
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