JavaScript Object Factory Functions

gistfile1.txt

// Wrap everything in an IIFE to avoid any globals leaking out.
(function (global) { 
	
	// Object Prototype, all instances created via 'matrix22' factory method will 
	// inherit from this object.
	var matrix22Proto = {
		zero: function() { 
			for (var i = 0; i < this.m.length; ++i) {
				this.m[i] = 0.0;
			}
			return this;
		}
	};
	
	// Factory function for creating new instances of the matrix22 object, note how
	// it's not a constructor function so doesn't need to be called with `new`.
	global.MW.matrix22 = function () {
		
		// Emulate ES5's Object.create()
		var Result = function () { };
		Result.prototype = matrix22Proto;
		
		// Initialise the new object.
		Result.rows = 2;
		Result.cols = 2;
		Result.m = [];
		
		// Return the new instance.
		return new Result();
	};
})(this);