freeCodeCamp/challenges/object-oriented-and-functional-programming.json

{
  "name": "Object Oriented and Functional Programming",
  "order": 0.010,
  "note": [
    "Waypoint: Closures",
    "Waypoint: Factories",
    "Waypoint: Pure Functions",
    "Waypoint: Currying Functions",
    "Waypoint: Functors",
    "Waypoint: Currying Functions"
  ],
  "challenges": [
    {
      "id":"cf1111c1c15feddfaeb1bdef",
      "title":"Waypoint: A Review On Objects",
      "difficulty":0,
      "description":[
        "Before we dive into Object Oriented Programming, let's revisit JavaScript objects.",
        "Give your <code>motorBike</code> object the correct attributes."
      ],
      "tests":[
        "assert(motorBike.wheels===2, 'You should have given motorBike two wheels');",
        "assert(motorBike.engine===1, 'You should have given motorBike one engine');",
        "assert(motorBike.seats===1, 'You should have given motorBike one seat');"
      ],
      "challengeSeed":[
        "//Here is a sample Object",
        "var car = {",
        " \"wheels\":4,",
        " \"engine\":1,",
        " \"seats\":5",
        "};",
        "",
        "//Now Let's make a similar Object called motorBike",
        "//Give it two wheels, one engine and one seat",
        "var motorBike = {",
        " \"wheels\":0,",
        " \"engine\":0,",
        " \"seats\":0",
        "};",
        "",
        "(function(){return(JSON.stringify(motorBike));})();"
      ],
      "challengeType":1
    },
    {
      "id":"cf1111c1c15feddfaeb2bdef",
      "title":"Waypoint: Constructing Objects",
      "difficulty":0,
      "description":[
        "We are also able to create objects using functions.",
        ""
      ],
      "tests":[
        "assert((new Car()).wheels === 4, \"myCar.wheels should be four. Make sure that you haven't changed this value\");",
        "assert(typeof((new Car()).engine) === 'number', 'myCar.engine should be a number');",
        "assert(typeof((new Car()).seats) === 'number', 'myCar.seats should be a number');"
      ],
      "challengeSeed":[
        "// Let's add the properties engine and seats to the car in the same way that the property wheels has been added below. They should both be numbers.",
        "var Car = function(){",
        " this.wheels = 4;",
        "};",
        "",
        "var myCar = new Car();",
        "",
        "(function(){return(JSON.stringify(myCar));})();"
      ],
      "challengeType":1
    },
    {
      "id":"cf1111c1c15feddfaeb3bdef",
      "title":"Waypoint: Understanding Public and Private Properties",
      "difficulty":0,
      "description":[
        "In the last challenge we use the <code>this</code> to reference public properties the current object or function.",
        "We can also create variables and functions that aren't accessible from outside the Object"
      ],
      "tests":[
        "assert(typeof(myBike.getSpeed)!=='undefined' && typeof(myBike.getSpeed) === 'function', 'The method getSpeed of myBike should be accessible outside the Object');",
        "assert(typeof(myBike.speed) === 'undefined', 'We should not been able');",
        "assert(typeof(myBike.addUnit === 'undefined'), '');"
      ],
      "challengeSeed":[
        "//Let's create an object with a two functions. One attached as a property and one not.",
        "var Car = function(){",
        "   this.gear = 1;",
        "   function addStyle(styleMe){",
        "       return('The Current Gear Is: ' + styleMe);",
        "   }",
        "   this.getGear = function(){",
        "       return(addStyle(this.gear));",
        "   };",
        "};",
        "",
        "//Make the function getSpeed of Bike publicly accessible",
        "",
        "var Bike = function(){",
        "   speed = 100;",
        "   function addUnit(value){",
        "     return(value + \"KM/H\");",
        "   }",
        "   ",
        "   getSpeed = function (){",
        "       return(addUnit(speed));",
        "   };",
        "   ",
        "};",
        "",
        "//Instantiated Here",
        "var myCar = new Car();",
        "var myBike = new Bike();",
        "",
        "if(myBike.hasOwnProperty('getSpeed')){(function(){return(JSON.stringify(myBike.getSpeed()));})();};"
      ],
      "challengeType":1
    },
    {
      "id":"cf1111c1c15feddfaeb4bdef",
      "title":"Waypoint: Instantiation",
      "difficulty":0,
      "description":[
        "Instantiation at it's most basic level is where you are creating a copy of an object from a template for use at a later time",
        "The instance inherits all the properties and methods of the original Object"
      ],
      "tests":[
        "assert((new Car()).wheels === 4, 'The property wheels should be four in the object constructor');",
        "assert(typeof((new Car()).engine) === 'undefined', 'There should not be a property engine in the object constructor');",
        "assert(myCar.wheels === 4, 'The property wheels of myCar should be four');",
        "assert(typeof(myCar.engine) === 'number', 'The property engine of myCar should be a number');"
      ],
      "challengeSeed":[
        "var Car = function(){",
        "   this.wheels = 4;",
        "};",
        "",
        "var myCar = new Car();",
        "",
        "//Add the property engine to myCar using dot notation and make it a number",
        "",
        "",
        "(function(){return(JSON.stringify(myCar));})();"
      ],
      "challengeType":1
    },
    {
      "id":"cf1111c1c15feddfaeb7bdef",
      "title":"Waypoint: Using .map",
      "difficulty":0,
      "description":[
        "<code>array = array.map(function(val){",
        " return(val+1);",
        "});</code>",
        "",
        "The map method is one of the easiest ways to iterate through an array or object there is. Let's use it now"
      ],
      "tests":[
        "assert.deepEqual(array, [4,5,6,7,8], 'You should have added three to each value in the array');",
        "assert(editor.getValue().match(/\\.map\\(/gi), 'You should be making use of the map method');",
        "assert(editor.getValue().match(/\\[1\\,2\\,3\\,4\\,5\\]/gi), 'You should only modify the array with .map');"
      ],
      "challengeSeed":[
        "//Use map to add three to each value in the array",
        "var array = [1,2,3,4,5];",
        "",
        "",
        "",
        "(function(){return(array);})();"
      ],
      "challengeType":1
    },
    {
      "id":"cf1111c1c15feddfaeb8bdef",
      "title":"Waypoint: Using .reduce",
      "difficulty":0,
      "description":[
        "Reduce can be useful for condensing and array or numbers into one value.",
        "<code>var singleVal = array.reduce(function(previousVal, currentVal){",
        "   return(previousVal+currentVal);",
        "}</code>"
      ],
      "tests":[
        "assert(singleVal == 30, 'singleVal should have been set to the result of you reduce operation');",
        "assert(editor.getValue().match(/\\.reduce\\(/gi), 'You should have made use of the reduce method');"
      ],
      "challengeSeed":[
        "var array = [4,5,6,7,8];",
        "var singleVal = 0;",
        "",
        "",
        "",
        "(function(){return(singleVal);})()"
      ],
      "challengeType":1
    },
    {
      "id":"cf1111c1c15feddfaeb9bdef",
      "title":"Waypoint: Using .filter",
      "difficulty":0,
      "description":[
        "",
        "filter is a useful method that can filter out values that don't match a certain criteria",
        "Let's remove all the values less than six",
        "<code>array = array.filter(function(val){",
        " return(val<4);",
        "});</code>"
      ],
      "tests":[
        "assert.deepEqual(array, [1,2,3,4,5], 'You should have removed all the values from the array that are less than six');",
        "assert(editor.getValue().match(/array\\.filter\\(/gi), 'You should be using the filter method to remove the values from the array');",
        "assert(editor.getValue().match(/\\[1\\,2\\,3\\,4\\,5\\,6\\,7\\,8\\,9\\,10\\]/gi), 'You should only be using .filter to modify the contents of the array);"
      ],
      "challengeSeed":[
        "var array = [1,2,3,4,5,6,7,8,9,10];",
        "",
        "",
        "",
        "(function(){return(array);})();"
      ],
      "challengeType":1
    },
    {
      "id":"cf1111c1c16feddfaeb1bdef",
      "title":"Waypoint: Using .sort",
      "difficulty":0,
      "description":[
        "You can use the method sort to easily sort the values in the array alphabetically or numerically",
        "<code>var array = [1,3,2];",
        "array = array.sort();</code>",
        "This will return [1, 2, 3]"
      ],
      "tests":[
        "assert.deepEqual(array, ['alpha', 'beta', 'charlie'], 'You should have sorted the array alphabetically');",
        "assert(editor.getValue().match(/\\[\\'beta\\'\\,\\s\\'alpha\\'\\,\\s'charlie\\'\\];/gi), 'You should be sorting the array using sort');",
        "assert(editor.getValue().match(/\\.sort\\(\\)/gi), 'You should have made use of the sort method');"
      ],
      "challengeSeed":[
        "var array = ['beta', 'alpha', 'charlie'];",
        "",
        "",
        "",
        "(function(){return(array);})();"
      ],
      "challengeType":1
    },
    {
      "id": "cf1111c1c16feddfaeb2bdef",
      "title": "Waypoint: Using .reverse",
      "difficulty": 0,
      "description": [
        "You can use the reverse method to reverse the contents of an array"
      ],
      "tests": [
        "assert.deepEqual(array, [7,6,5,4,3,2,1], 'You should reverse the array');",
        "assert(editor.getValue().match(/\\.reverse\\(\\)/gi), '');",
        "assert(editor.getValue().match(/\\[1\\,2\\,3\\,4\\,5\\,6\\,7/gi), '');"
      ],
      "challengeSeed": [
        "var array = [1,2,3,4,5,6,7];",
        "",
        "",
        "",
        "(function(){return(array);})();"
      ],
      "challengeType": 1
    },
    {
      "id": "cf1111c1c16feddfaeb3bdef",
      "title": "Waypoint: Using .concat",
      "difficulty": 0,
      "description": [
        "Concat can be used to merge the contents of two arrays into one",
        "<code>array = array.concat(otherArray);</code>"
      ],
      "tests": [
        "assert.deepEqual(array, [1,2,3,4,5,6], 'You should concat the two arrays together');",
        "assert(editor.getValue().match(/\\.concat\\(/gi), 'You should be using the concat method to merge the two arrays');",
        "assert(editor.getValue().match(/\\[1\\,2\\,3\\]/gi) && editor.getValue().match(/\\[4\\,5\\,6\\]/gi), 'You should only modify the two arrays without changing the origional ones');"
      ],
      "challengeSeed": [
        "var array = [1,2,3];",
        "",
        "var concatMe = [4,5,6];",
        "",
        "",
        "",
        "(function(){return(array);})()"
      ],
      "challengeType": 1
    },
    {
      "id":"cf1111c1c16feddfaeb4bdef",
      "title":"Waypoint: Using .split",
      "difficulty":0,
      "description":[
        "",
        "You can use the split method to split a string into an array",
        "split uses the argument you give to to split the string",
        "<code>array = string.split(' ');</code>"
      ],
      "tests":[
        "assert(typeof(array) === 'object' && array.length === 5, 'You should have split the string by it\\'s spaces');",
        "assert(/\\.split\\(/gi, 'You should have made use of the split method on the string');"
      ],
      "challengeSeed":[
        "var string = \"Split me into an array\";",
        "",
        "var array = string;",
        "",
        "(function(){return(array);})();"
      ],
      "challengeType":1
    },
    {
      "id":"cf1111c1c16feddfaeb5bdef",
      "title":"Waypoint: Using .join",
      "difficulty":0,
      "description":[
        "We can use the join method to join each element in an array into a string separated by whatever delimiter you provide as an argument to the join operation",
        "<code>var joinMe = joinMe.join(\" \");</code>"
      ],
      "tests":[
        "assert(typeof(joinMe) === 'string' && joinMe === \"Split me into an array\", 'You should have joined the arrays by it\\'s spaces');",
        "assert(/\\.join\\(/gi, 'You should have made use of the join method on the array');"
      ],
      "challengeSeed":[
        "var joinMe = [\"Split\",\"me\",\"into\",\"an\",\"array\"];",
        "",
        "joinMe = joinMe;",
        "",
        "(function(){return(joinMe);})();"
      ],
      "challengeType":1
    }
  ]
}