Javascript Prototypes,objects,constructor??i am confused

Question

I have gone through plenty of Stack Overflow question that had description but I seriously found them very confusing. What I want is a simple explanation,please don\'t refer

Answer 1

I guess I am too late, but here would be my 2 cents:

Prototype:

String.prototype.x = "yahoo"

now every instance of String will have the property x.

So be it (new String()).x or "".x both have the value equal to yahoo

Hence it's like extending a predefined class.

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Objects

Everything in JavaScript, except the other primitive types, is an object.

An object is a collection of name-value pairs, nothing more, nothing less.

{"a": 0, "b" : 1}

Even an Array is an object in JS with some additional properties & methods.

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Functions & Methods

Here is a function :

function a() { };

Now let's give it the status of a method of an Array:

Array.prototype.a = a;

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Constructor:

new String()

gets the implementation of String from : String.constructor

Similarly the code you write in any function goes into this very function.