week2day2challenge.js

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// In case you didn't know, there is a Math object
// with all sorts of cool methods attached to it
// Let's take a look at Math.max();
// Call Math.max with an array of numbers
// i.e. Math.max(1,5,75,4,11);

Math.max(1, 2, 3, 4);

// Now declare a variable allNums that references a
// array of numbers

var allNums = [117, 341, 56, 17];

// Now use apply to use Math.max() on allNums

Math.max.apply(this, allNums);

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// Write two functions, sum and square, now write
// another function called squareOfSum that accepts two
// functions(sum and square) and returns a new function
// that computes square(sum());
// Now, here's this trick, do it using call() and apply()

function sum(num1, num2) { return num1 + num2; }

function square(num) { return num * num; }

function squareOfSum(fn1, fn2) {
  return function () {
    return fn1.call(this, fn2.apply(this, arguments));
  }
}

var myFunc = squareOfSum(square, sum);
myFunc(2,3);

// Using apply to execute functions with an array 
// of arguments. 
// This is used for creating functions that
// can accept any number of arguments as opposed
// to a fixed number. 

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// Create an object called reindeer with properties dancer,
// prancer, and comet and assign them qualities 
// (ex. Dancer: most dexterous, prancer: most cheerful.. etc)
// and then create the property Rudolf assigning it “the most
// famous reindeer of all”.

var reindeer = {
  dancer: 'most dexterous',
  prancer: 'most cheerful',
  comet: 'most sleepy',
  rudolf: 'the most famous reindeer of all'
};

// now, create a method called recall which console logs
// the most famous reindeer of all. Call this function using call.

function recall() { console.log(this.rudolf); }

recall.call(reindeer);


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// Create a function called snowball with a closure inside
// called dirt with a closure inside it called bigRock and
// call a function which dynamically logs the sentence “Ouch!
// the snowball has a bigRock inside it!” using the keyword “this"
// instead of hardcoding bigRock. call this function using .call

function snowball() {
  return function dirt() {
    return function bigRock() {
      return function () { console.log(this.message); }
    }
  }
}

var message = "Ouch! The snowball has a bigRock inside it!"
snowball()()().call(this);


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// Create a function called snow which passes the value
// of “this" to a closure called flake and then console
// logs that the value of this from the above function.

function snow(context) {
  return function flake() {
    console.log(context);
  }
}

snow(this)();