this - Part 3 - new and window binding

this-new-and-window.js

// 1 - Implicit binding
// 2 - Explicit binding
// 3 - new binding
// 4 - window binding

// new Binding
// this is bound to the new object being constructed
var Animal = function(color, name, type) {
  //this = {}; JS does this automatically for us behind the scenes.
  this.color = color;
  this.name = name;
  this.type = type;
};

var zebra = new Animal('black and white', 'Zorro', 'Zebra');

// window Binding
// if none of the previous rules apply, then default to the window object. Unless youre in strict mode and it will return 'not declared'.
var sayAge = function() {
  // 'use strict'; 
  // strict mode prevents the this keyword from binding to the window in this scenario
  console.log(this.age);
}

var me = {
  age: 25
};

sayAge();
// undefined

window.age = 35;
sayAge();
// 35