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Added Regex, Random Numbers and If else Challenges
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benmcmahon100
2015-07-24 00:38:13 +01:00
parent 003805d834
commit a24ef288b4
1 changed files with 163 additions and 4 deletions
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167
seed/challenges/basic-javascript.json
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@ -886,12 +886,20 @@
"While it's great that we can create random decimal numbers it's a lot more useful to generate a random whole number",
"To achieve this we can multiply the random number by ten and use the <code>Math.floor()</code> to convert the decimal number to a whole number",
"This technique gives us a whole number between zero and nine",
"Example:",
"<code>Math.floor(Math.random()*10);</code>",
"Let's give this technique a go now"
],
"tests":[],
"tests":[
"assert(typeof(myFunction()) == 'number', 'The result of myFunction should be a number');",
"assert(editor.getValue().match(/Math.random/g), 'You should be using Math.random to create a random number');",
"assert(!(''+myFunction()).match(/\\./g), 'You should have multiplied the result of Math.random but 10 to make it a number that\\'s greater then zero');",
"assert(editor.getValue().match(/Math.floor/g), 'You should use Math.floor to remove the decimal part of the number');"
],
"challengeSeed":[
"function myFunction(){",
" //Make myFunction return a random number between zero and nine instead of a float",
" return(Math.random());",
"}",
"",
"(function(){return(myFunction());})();"
@ -899,16 +907,167 @@
"challengeType": 1
},
{
"_id":"",
"_id":"bh1111c1c12feddfaeb2bdef",
"name":"Random Whole Numbers In a Range",
"dashedName":"waypoint-random-whole-numbers-in-a-range",
"difficulty":"9.9829",
"description":[
"",
"We can use a certain mathematical expression to get a random number between between twp numbers.",
"<code>Math.floor(Math.random() * (max - min + 1)) + min</code>",
"By using this we can control the output of the random number.",
""
],
"tests":[],
"challengeSeed":[],
"tests":[
"assert(myFunction() >= min, 'The random number that\\'s generated by myFunction should be greater than or equal to the minimum number');",
"assert(myFunction() <= max, 'The random number that\\'s generated by myFunction should be less than or equal to the maximum number');",
"assert((function(){if(editor.getValue().match(/max/g).length >= 2 && editor.getValue().match(/min/g).length >= 3 && editor.getValue().match(/Math.floor/g) && editor.getValue().match(/Math.random/g)){return(true);}else{return(false);}})(), 'You should be using the function given in the description to calculate the random in number in a range');"
],
"challengeSeed":[
" var min = 0;",
" var max = 12;",
"function myFunction(){",
" //Make myFunction return a random number between zero and nine instead of a float",
" return(Math.random());",
"}",
"",
"(function(){return(myFunction());})();"
],
"challengeType": 1
},
{
"_id":"bh1111c1c12feddfaeb3bdef",
"name":"If Else Statements",
"dashedName":"waypoint-if-else-statements",
"difficulty":"9.983",
"description":[
"",
"We can use if statements in JavaScript to only execute code if a certain condition is met",
"if statements require some sort of boolean condition evaluate",
"Example:",
"<code>if(1==2){",
" return(true);",
"}",
"else{",
" return(false);",
"}</code>",
"Let's have a go of using if statements now by making a coin-flip game",
"Create an if else statement to return <code>heads</code> if the flip var is zero and to return <code>tails</code> if it's not"
],
"tests":[
"assert((function(){if(myFunction() == 'heads' || myFunction() == 'tails'){return(true);}else{return(false);}})(), 'myFunction should either return heads or tails');",
"assert(editor.getValue().match(/if/g).length >= 3, 'You should have created a new if statement');",
"assert(editor.getValue().match(/else/g).length >= 2, 'You should have created a new else statement');"
],
"challengeSeed":[
"function myFunction(){",
" var flip = Math.floor(Math.random() * (1 - 0 + 1)) + 0;",
" //Create and if else statement here to return heads if flip is 0 otherwise return false",
" ",
"}",
"",
"(function(){return(myFunction());})();"
],
"challengeType": 1
},
{
"_id":"bh1111c1c12feddfaeb6bdef",
"name":"An Intro To RegEx",
"dashedName":"waypoint-an-intro-to-regex",
"difficulty":"9.984",
"description":[
"",
"RegEx is a powerful tool we can use to find certain words or patterns in strings",
"RegEx can look difficult at first but there's not much to getting it working",
"If we wanted to find the number of times the word \"the\" occured in the string \"The dog chased the cat\" We could use the following RegEx:",
"<code>\/the+\/gi</code>",
"Let's break this down a bit",
"\"The\" is the pattern we want to match",
"\"+\" means we are looking for one or more occurrences of this pattern",
"\"g\" means that it searhces the whole string",
"\"i\" means that we are ignoring the case(upper or lower) of what we are looking for",
"Let's try finding the word and in the string \"John and Alan went to the shop and got some milk\" by replacing the <code>.+</code> in the currnet RegEx with something that will find the word \"and\" and count how many times it occurs"
],
"tests":[
"assert(test==2, 'You\\'re RegEx should have found two occurances of the word \"and\"');",
"assert(editor.getValue().match(/\\/and\\+\\/gi/), 'You should have used this RegEx to find the word \"and\"');"
],
"challengeSeed":[
"var test = (function(){",
" var testString = \"John and Alan went to the shop and got some milk\";",
"",
"//Do Not Modify Above",
"",
" var expression = /.+/gi;",
"",
"//Do Not Modify Below",
"",
" return(testString.match(expression).length);",
"})();(function(){return(test);})();"
],
"challengeType": 1
},
{
"_id":"bh1111c1c12feddfaeb7bdef",
"name":"Finding Numbers",
"dashedName":"waypoint-finding-numbers",
"difficulty":"9.985",
"description":[
"",
"We can use special selectors in RegEx to select a particular type of value",
"One such selector is the digit selector <code>\\d</code> which is used to grab the numbers in a string",
"It is used like this:",
"<code>/\\d+/g</code>",
""
],
"tests":[
"assert(test === 2, 'Your RegEx should have found two numbers in the testString');",
"assert(editor.getValue().match(/\\/\\\\d\\+\\//gi), 'You should be using the following expression /\\d+/gi to find the numbers in the testString');"
],
"challengeSeed":[
"var test = (function(){",
" var testString = \"There's 3 cats but 4 dogs.\"",
"",
"//Do Not Modify Above",
"",
" var expression = /.+/gi;",
"",
"//Do Not Modify Below",
"",
" return(testString.match(expression).length);",
"})();(function(){return(test);})();"
],
"challengeType": 1
},
{
"_id":"bh1111c1c12feddfaeb8bdef",
"name":"Finding WhiteSpace",
"dashedName":"waypoint-finding-whitespace",
"difficulty":"9.987",
"description":[
"",
"We can also use selectors like <code>\\s</code> to find spaces in a string",
"It is used like this:",
"<code>/\\s+/g</code>",
""
],
"tests":[
"assert(test === 7, 'Your RegEx should have found seven spaces in the testString');",
"assert(editor.getValue().match(/\\/\\\\s\\+\\//gi), 'You should be using the following expression /\\s+/gi to find the spaces in the testString');"
],
"challengeSeed":[
"var test = (function(){",
" var testString = \"How many spaces are there in this sentance.\";",
"",
"//Do Not Modify Above",
"",
" var expression = /.+/gi;",
"",
"//Do Not Modify Below",
"",
" return(testString.match(expression).length);",
"})();(function(){return(test);})();"
],
"challengeType": 1
}
]