newOperator function

newOperator.js

/*
 * This is an illustration of the new Object() functionality for JavaScript written
 * as a function.
 */
 
function extend(a, b) {
	var c = {}, attr;
	for (attr in a) {
		if (Object.prototype.hasOwnProperty.call(a, attr)) {
			c[attr] = a[attr];
		}
	}
	for (attr in b) { 
		if (Object.prototype.hasOwnProperty.call(b, attr)) {
			c[attr] = b[attr]; 
		}
	}
	return c;
}

function newOperator( func, proto, args ) {
	
	var instance = extend( {}, proto );
	
	func.apply( instance, args );
	
	return instance;
	
};


function LoggerClass( message ) {
	console.log('Creating new Logger');
	this.message = message;
	this.count = 0;
}

var prototype = {
	
	log: function() {
		this.count++;
		console.log( this.count, this.message );
	}
	
};

var arguments = ["hello"];

var logger = newOperator( LoggerClass, prototype, arguments );
// >>> Creating new object

logger.log(); 
// >> 1, hello

logger.log(); 
// >> 2, hello

logger.message = "Goodbye";
logger.log();
// >> 3, Goodbye