Prototype chain in Js

app.js

// Simple copy or deep copy  of any object to other is just a copy of available properties of object to the other.

// Prototypical copy or chaining of any object is done by Object.create() method.
var a = {a:1};
var b = Object.create(a); // now b will have all properties of a and future proprties of a too.

// Where as in prototypical chain , child object delegates all the request for the properties to the parent 
// which are not found in the object.

// It works like the inherited parent Object, property lookups are only delegated to parent object only when it is 
// not found in child object.

// We can override properties of the parent object.

// Helps in removing code duplication.

// All objects inherit Object prototype. which has toString(), hasOwnProperty() etc.
// All Arrays inherit Array prototype , which has some overriden methods of Object prototype. i.e - toString() for arrays 
// are diffrent.

// Hence Arrays inherit Array prototype which inherits Object prototype.

// Hence any lookup in a normal array will look for the property in the array, if not found  then in Array prototype(imediate parent)
// , and again if it is not found then in Object prototype (super parent).