js extends vs extend

extendsVsextend.js

//A rough demo of extends vs extend

/*
 * Extends - the second object needs to already be initialized
 * after that, it will extend the first object
 *
 * var o1 = {"a": 1, "b": 2};
 * var o2 = {};
 * o2.extends(o1);
*/
Object.prototype.extends = function(ext){
	var self = this;

	for(var n in ext){
		if(ext.hasOwnProperty(n) && !self.hasOwnProperty(n)){
			self[n] = ext[n];
		}
	}

	return self;
}

/*
 * Extend - the second object DOES NOT need to be initialized
 * in order to extend the first object
 *
 * var o1 = {"a": 1, "b": 2};
 * var o2 = o1.extend({})
 * OR overrided the orig vals
 * var o2 = o1.extend({a: moo})
*/
Object.prototype.extend = function(ext){
	var self = this;

	// can add this line as a safty net. adds some parity to
	// the above 'extends' example
	ext = (typeof ext === "undefined") ? {} : ext

	for(var n in self){
		if(self.hasOwnProperty(n) && !ext.hasOwnProperty(n)){
			ext[n] = self[n];
		}
	}

	return ext;
}