Beginning Object-Oriented JavaScript - SlideShare

Beginning Object-Oriented JavaScript - SlideShare

Constructor functions
when invoked with new, functions return an object known as this
you can modify this before it’s returned

Built-in constructors
Object Array Function Regexp Number String Boolean Date Error, Syntax Error ,...

Prototype…
is a property of the function objects

>>> var boo = function(){};
>>> typeof boo.prototype
"object"

The prototype is used when a function is called as a constructor

__proto__
The objects have a secret link to the prototype of the constructor that created them
__proto__ is not directly exposed in all browsers

Inheritance

function NormalObject() {
  this.name = 'normal';
  this.getName = function() {
   return this.name; 
  };
}   
function PreciousObject(){ 
  this.shiny = true; 
  this.round = true; 
}  
PreciousObject.prototype = 
  new NormalObject(); 

Beget object

function object(o) {
  function F(){}
  F.prototype = o;
  return new F();
}