Javascript Code Challenge and Implementation. http://eblundell.com/javascript-challenge

jcci.js

Array.prototype.joinProperty = function(method, delim) {
	var output = [];
	for(var i=0; i < this.length; i++){
		if(typeof this[i][method] == 'function'){
			output.push(this[i][method]());
		} else {
			output.push(this[i][method]);
		}
	}
	return output.join(delim);
}

x = {item:'coffee'}
y = {item:'milk'}
z = {item:'tea'}

var myArr = [x,y,z];

console.log(myArr.joinProperty('item'));

/**
* @constructor
*/
function testObject(message){
	this.message = message;
}

testObject.prototype.getMessage = function() { 
	return this.message;
};

a = new testObject('paper');
b = new testObject('plastic');
c = new testObject('metal');

var secondArr = [a,b,c];

console.log(secondArr.joinProperty('getMessage', '-'));