Use of newer ECMAScript functions

newerecma.js

UserHuntInfo.getMonstersInRange = function(latitude, longitude, range, placedMonsters) {
	checkTypes(arguments, "number", "number", "number", Array);
	return placedMonsters.filter(function(monster) {
		return distanceOverEarth(latitude, longitude, monster.latitude, monster.longitude) <= (range/1000);
	});
};

// vs

UserHuntInfo.getMonstersInRange = function(latitude, longitude, range, placedMonsters)
{
	checkTypes(arguments, "number", "number", "number", Array);

	var inRangeMonsters = [];

	for (var i = 0; i < placedMonsters.length; i++)
	{
		var monster = placedMonsters[i];
		var dist = distanceOverEarth(latitude, longitude, monster.latitude, monster.longitude);


		if (dist <= (range / 1000))
		{
			inRangeMonsters.push(monster);
		}
	}

	return inRangeMonsters;
};