functional style while loop

Array.prototype.while.js

//http://deploytonenyures.blogspot.fr/2014/10/canceling-functional-style-iteration.html

//function stopCondition(item, index, array) returns true to indicate stop
//function action(item, index, array)
Array.prototype.while = function(stopCondition, action){
	var curPos = 0;
	while (curPos < this.length && !stopCondition(this[curPos], curPos, this)){
		action(this[curPos], curPos, this);
		curPos++;
	}
};

testIt.js

var items = ["Asturies", "Armenia", "Austria", "France", "Germany"];

items.while(
	function(it){
		return it[0] != "A";
	}, 
	function(it){
		console.log(it.toUpperCase());
	}
);

console.log("----------------------------");
//using forEach we would have to resort to simulating a break with an Exception:
try{
	items.forEach(function(it){
		if(it[0] != "A"){
			throw "break";
		}
		console.log(it.toUpperCase());
	});
}
catch (ex){
	if (ex != "break"){
		throw ex;
	}
}

console.log("----------------------------");

//but we can do it with _.first and avoid rolling out our own while function
var _ = require('./libs/lodash.js');
_.first(items, function(it){
	return it[0] == "A";
})
.forEach(function(it){
	console.log(it.toUpperCase());
});