Merge pull request #7952 from erictleung/fix/add-solutions-to-challenges
Add solutions to Basic JS, OOP, and Automated Testpull/8131/head
Berkeley Martinez
commit
07d0d4fca5
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@ -4168,7 +4168,7 @@
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"(function(z){return z;})(myDog);"
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],
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"solutions": [
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"var ourDog = {\n \"name\": \"Camper\",\n \"legs\": 4,\n \"tails\": 1,\n \"friends\": [\"everything!\"],\n \"bark\": \"bow-wow\"\n};\n\nvar myDog = {\n \"name\": \"Happy Coder\",\n \"legs\": 4,\n \"tails\": 1,\n \"friends\": [\"Free Code Camp Campers\"],\n \"bark\": \"woof\"\n};\n\ndelete myDog.tails;"
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"var ourDog = {\n \"name\": \"Camper\",\n \"legs\": 4,\n \"tails\": 1,\n \"friends\": [\"everything!\"],\n \"bark\": \"bow-wow\"\n};\nvar myDog = {\n \"name\": \"Happy Coder\",\n \"legs\": 4,\n \"tails\": 1,\n \"friends\": [\"Free Code Camp Campers\"],\n \"bark\": \"woof\"\n};\ndelete myDog.tails;"
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],
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"tests": [
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"assert(myDog.tails === undefined, 'message: Delete the property <code>\"tails\"</code> from <code>myDog</code>.');",
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@ -4572,8 +4572,8 @@
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"The <code>initialization</code> statement is executed one time only before the loop starts. It is typically used to define and setup your loop variable.",
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"The <code>condition</code> statement is evaluated at the beginning of every loop iteration and will continue as long as it evalutes to <code>true</code>. When <code>condition</code> is <code>false</code> at the start of the iteration, the loop will stop executing. This means if <code>condition</code> starts as <code>false</code>, your loop will never execute.",
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"The <code>final-expression</code> is executed at the end of each loop iteration, prior to the next <code>condition</code> check and is usually used to increment or decrement your loop counter.",
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"In the following example we initialize with <code>i = 0</code> and iterate while our condition <code>i < 5</code> is true. We'll increment <code>i</code> by <code>1</code> in each loop iteration with <code>i++</code> as our <code>final-expression</code>.",
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"<blockquote>var ourArray = [];<br>for (var i = 0; i < 5; i++) {<br> ourArray.push(i);<br>}</blockquote>",
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"In the following example we initialize with <code>i = 0</code> and iterate while our condition <code>i < 5</code> is true. We'll increment <code>i</code> by <code>1</code> in each loop iteration with <code>i++</code> as our <code>final-expression</code>.",
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"<blockquote>var ourArray = [];<br>for (var i = 0; i < 5; i++) {<br> ourArray.push(i);<br>}</blockquote>",
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"<code>ourArray</code> will now contain <code>[0,1,2,3,4]</code>.",
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"<h4>Instructions</h4>",
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"Use a <code>for</code> loop to work to push the values 1 through 5 onto <code>myArray</code>."
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@ -4629,8 +4629,8 @@
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"title": "Iterate Odd Numbers With a For Loop",
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"description": [
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"For loops don't have to iterate one at a time. By changing our <code>final-expression</code>, we can count by even numbers.",
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"We'll start at <code>i = 0</code> and loop while <code>i < 10</code>. We'll increment <code>i</code> by 2 each loop with <code>i += 2</code>.",
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"<blockquote>var ourArray = [];<br>for (var i = 0; i < 10; i += 2) {<br> ourArray.push(i);<br>}</blockquote>",
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"We'll start at <code>i = 0</code> and loop while <code>i < 10</code>. We'll increment <code>i</code> by 2 each loop with <code>i += 2</code>.",
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"<blockquote>var ourArray = [];<br>for (var i = 0; i < 10; i += 2) {<br> ourArray.push(i);<br>}</blockquote>",
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"<code>ourArray</code> will now contain <code>[0,2,4,6,8]</code>.",
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"Let's change our <code>initialization</code> so we can count by odd numbers.",
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"<h4>Instructions</h4>",
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@ -4683,8 +4683,8 @@
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"description": [
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"A for loop can also count backwards, so long as we can define the right conditions.",
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"In order to count backwards by twos, we'll need to change our <code>initialization</code>, <code>condition</code>, and <code>final-expression</code>.",
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"We'll start at <code>i = 10</code> and loop while <code>i > 0</code>. We'll decrement <code>i</code> by 2 each loop with <code>i -= 2</code>.",
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"<blockquote>var ourArray = [];<br>for (var i=10; i > 0; i-=2) {<br> ourArray.push(i);<br>}</blockquote>",
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"We'll start at <code>i = 10</code> and loop while <code>i > 0</code>. We'll decrement <code>i</code> by 2 each loop with <code>i -= 2</code>.",
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"<blockquote>var ourArray = [];<br>for (var i=10; i > 0; i-=2) {<br> ourArray.push(i);<br>}</blockquote>",
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"<code>ourArray</code> will now contain <code>[10,8,6,4,2]</code>.",
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"Let's change our <code>initialization</code> and <code>final-expression</code> so we can count backward by twos by odd numbers.",
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"<h4>Instructions</h4>",
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@ -4833,7 +4833,7 @@
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"description": [
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"You can run the same code multiple times by using a loop.",
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"Another type of JavaScript loop is called a \"<code>while loop</code>\", because it runs \"while\" a specified condition is true and stops once that condition is no longer true.",
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"<blockquote>var ourArray = [];<br>var i = 0;<br>while(i < 5) {<br> ourArray.push(i);<br> i++;<br>}</blockquote>",
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"<blockquote>var ourArray = [];<br>var i = 0;<br>while(i < 5) {<br> ourArray.push(i);<br> i++;<br>}</blockquote>",
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"Let's try getting a while loop to work by pushing values to an array.",
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"<h4>Instructions</h4>",
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"Push the numbers 0 through 4 to <code>myArray</code> using a <code>while</code> loop."
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@ -5017,7 +5017,7 @@
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"(function(){return randomWholeNum();})();"
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],
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"solutions": [
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"var randomNumberBetween0and19 = Math.floor(Math.random() * 20);\n\nfunction randomWholeNum() {\n return Math.floor(Math.random() * 10);\n}"
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"var randomNumberBetween0and19 = Math.floor(Math.random() * 20);\nfunction randomWholeNum() {\n return Math.floor(Math.random() * 10);\n}"
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],
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"tests": [
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"assert(typeof randomWholeNum() === \"number\" && (function(){var r = randomWholeNum();return Math.floor(r) === r;})(), 'message: The result of <code>randomWholeNum</code> should be a whole number.');",
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@ -5153,7 +5153,7 @@
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"(function(){return andCount;})();"
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],
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"solutions": [
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"var testString = \"Ada Lovelace and Charles Babbage designed the first computer and the software that would have run on it.\";\nvar expression = /and/gi; // Change this Line\nvar andCount = testString.match(expression).length;"
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"var testString = \"Ada Lovelace and Charles Babbage designed the first computer and the software that would have run on it.\";\nvar expression = /and/gi;\nvar andCount = testString.match(expression).length;"
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],
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"tests": [
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"assert(andCount==2, 'message: Your <code>regular expression</code> should find two occurrences of the word <code>and</code>.');",
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@ -5207,7 +5207,7 @@
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"(function(){return digitCount;})();"
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],
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"solutions": [
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"var testString = \"There are 3 cats but 4 dogs.\";\nvar expression = /\\d+/g; // Change this line\nvar digitCount = testString.match(expression).length;"
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"var testString = \"There are 3 cats but 4 dogs.\";\nvar expression = /\\d+/g;\nvar digitCount = testString.match(expression).length;"
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],
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"tests": [
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"assert(digitCount === 2, 'message: Your regular expression should find two numbers in <code>testString</code>.');",
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@ -5256,7 +5256,7 @@
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"(function(){return spaceCount;})();"
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],
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"solutions": [
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"var testString = \"How many spaces are there in this sentence?\";\nvar expression = /\\s+/g; // Change this line\nvar spaceCount = testString.match(expression).length;"
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"var testString = \"How many spaces are there in this sentence?\";\nvar expression = /\\s+/g;\nvar spaceCount = testString.match(expression).length;"
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],
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"tests": [
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"assert(spaceCount === 7, 'message: Your regular expression should find seven spaces in <code>testString</code>.');",
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@ -321,6 +321,9 @@
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"tail": [
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"(function() {return newArray;})();"
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],
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"solutions": [
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"var oldArray = [1,2,3,4,5];\nvar newArray = oldArray.map(function(val){\n return val + 3;\n});"
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],
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"tests": [
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"assert.deepEqual(oldArray, [1,2,3,4,5], 'message: You should not change the original array.');",
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"assert.deepEqual(newArray, [4,5,6,7,8], 'message: You should add three to each value in the array.');",
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@ -363,6 +366,9 @@
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"tail": [
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"(function() {return singleVal;})();"
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],
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"solutions": [
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"var array = [4,5,6,7,8];\nvar singleVal = 0;\nsingleVal = array.reduce(function(previousVal, currentVal) {\n return previousVal + currentVal;\n}, 0);"
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],
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"tests": [
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"assert(singleVal == 30, 'message: <code>singleVal</code> should be equal to the sum of all items in the <code>array</code> variable.');",
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"assert(editor.getValue().match(/\\.reduce\\s*\\(/gi), 'message: You should have made use of the <code>reduce</code> method.');"
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@ -403,6 +409,9 @@
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"tail": [
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"(function() {return newArray;})();"
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],
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"solutions": [
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"var oldArray = [1,2,3,4,5,6,7,8,9,10];\nvar newArray = oldArray.filter(function(val) {\n return val < 6;\n});"
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],
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"tests": [
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"assert.deepEqual(oldArray, [1,2,3,4,5,6,7,8,9,10], 'message: You should not change the original array.');",
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"assert.deepEqual(newArray, [1,2,3,4,5], 'message: You should have filtered out all values from the array that are greater than 5.');",
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@ -446,6 +455,9 @@
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"tail": [
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"(function() {return array;})();"
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],
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"solutions": [
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"var array = [1, 12, 21, 2];\narray.sort(function(a, b) {\n return b - a;\n});"
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],
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"tests": [
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"assert.deepEqual(array, [21, 12, 2, 1], 'message: You should have sorted the array from largest to smallest.');",
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"assert(editor.getValue().match(/\\[1,\\s*12,\\s*21,\\s*2\\];/gi), 'message: You should only be using <code>sort</code> to modify the array.');",
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@ -487,6 +499,9 @@
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"tail": [
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"(function() {return newArray;})();"
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],
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"solutions": [
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"var array = [1,2,3,4,5,6,7];\nvar newArray = [];\nnewArray = array.reverse();"
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],
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"tests": [
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"assert.deepEqual(newArray, [7,6,5,4,3,2,1], 'message: You should reverse the array.');",
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"assert(editor.getValue().match(/\\.reverse\\s*\\(\\)/gi), 'message: You should use the <code>reverse</code> method.');",
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@ -527,6 +542,9 @@
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"tail": [
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"(function() {return newArray;})();"
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],
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"solutions": [
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"var oldArray = [1,2,3];\nvar newArray = [];\nvar concatMe = [4,5,6];\nnewArray = oldArray.concat(concatMe);"
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],
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"tests": [
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"assert.deepEqual(newArray, [1,2,3,4,5,6], 'message: You should concatenate the two arrays together.');",
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"assert(editor.getValue().match(/\\.concat\\s*\\(/gi), 'message: You should be using the <code>concat</code> method to merge the two arrays.');",
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@ -564,6 +582,9 @@
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"tail": [
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"(function() {return array;})();"
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],
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"solutions": [
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"var string = \"Split me into an array\";\nvar array = [];\narray = string.split(\" \");"
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],
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"tests": [
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"assert(/\\.split\\(/gi, 'message: You should use the <code>split</code> method on the string.');",
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"assert(typeof array === 'object' && array.length === 5, 'message: You should split the string by its spaces.');"
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@ -599,6 +620,9 @@
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"tail": [
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"(function() {return joinedString;})();"
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],
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"solutions": [
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"var joinMe = [\"Split\",\"me\",\"into\",\"an\",\"array\"];\nvar joinedString = '';\njoinedString = joinMe.join(\" \");"
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],
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"tests": [
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"assert(typeof joinedString === 'string' && joinedString === \"Split me into an array\", 'message: You should join the elements of the array with spaces.');",
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"assert(/\\.join\\(/gi, 'message: You should use of the <code>join</code> method on the array.');"
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@ -18,6 +18,9 @@
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"",
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""
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],
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"solutions": [
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"console.log('Hello world!');"
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],
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"tests": [
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"assert(editor.getValue().match(/console\\.log\\(/gi), 'message: You should use the console.log method to log \"Hello world!\" to your JavaScript console.');"
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],
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@ -48,6 +51,9 @@
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"",
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""
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],
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"solutions": [
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"console.log(typeof \"\");\nconsole.log(typeof 0);\nconsole.log(typeof []);\nconsole.log(typeof {});"
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],
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"tests": [
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"assert(code.match(/console\\.log\\(typeof[\\( ][\"'].*[\"']\\)?\\);/), 'message: You should <code>console.log</code> the <code>typeof</code> a string.');",
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"assert(code.match(/console\\.log\\(typeof[\\( ]\\d+\\.?\\d*\\)?\\);/), 'message: You should <code>console.log</code> the <code>typeof</code> a number.');",
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