Answers.md

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Describe some of the differences between .forEach & .map.

• forEach is a method that allows you to loop over an array. It calls a provided function (callback) on each element in the array. The forEach method will affect and change the original Array. The forEach method throws away return values and returns undefined.
• Map is also a method that calls a provided function on each element in the array. The difference is that it returns a new array, leaving the original array unchanged. The map method allocates memory and stores return values.

Name five different Types in JavaScript. A Type is something that can represent data. What is so special about Arrays?

• Boolean, Number, String, Null, Undefined
• An array is a type of object. It behaves differently from regular objects. Every new array inherits extra methods from Array.Prototype. An array can do everything that an object can do plus more.

What is closure? Can you code out a quick example of a closure?

• Closures gives you access to an outer function's scope from an inner function.A closure is created when a function is defined.The closure encompasses everything the defined function can access. Without closures it would be hard to implement something like a callback. Closures are related to scopes, but they are not the same thing.
• Coded example

var G = 'G'
function functionA() {
    var A = 'A';

    function functionsB() {
        var B = 'B';
        console.log(A, B, G)
    }

    functionB();

}
 functionA();

• In this example two closures are created within the two functions defined. Function B is able to access it's own scope plus funcrionA() scope and the global scope.

Describe the four rules of the 'this' keyword. No need to provide examples about it this time :)

1. Global- Whenever a function is contained in the global scope, the value of this inside of that function will be the window object.
2. Implicit- whenever a function is called by a preceding dot, the object before that dot is this.
3. New Keyword- Whenever a constructor is used, this refers to the specific instance of the object that is created and returned by the constructor function.
4. Explicit- When the call, apply, or bind methods are used, this is explicitly defined