Untitled

Object.beget = (function(Function){

    return function(Object){

        Function.prototype = Object;

        return new Function;

    }

})(function(){});

/*

It's a killer! Pity how almost no one uses it.

It allows you to "beget" new instances of any object, extend them, while maintaining a (live) prototypical inheritance link to their other properties. Example:

*/

var A = {

  foo : 'greetings'

};  

var B = Object.beget(A);

 

alert(B.foo);     // 'greetings'

 

// changes and additionns to A are reflected in B

A.foo = 'hello';

alert(B.foo);     // 'hello'

 

A.bar = 'world';

alert(B.bar);     // 'world'

 

 

// ...but not the other way around

B.foo = 'wazzap';

alert(A.foo);     // 'hello'

 

B.bar = 'universe';

alert(A.bar);     // 'world'