Example using the ES6 map helper.

ES6 .map

var numbers = [1,2,3];
var doubledNumbers = [];

// want to move away from this
for (var i = 0; i < numbers.length; i++) {
 doubledNumbers.push(numbers[i] * 2); 
}

// creates a new array with values returned from function
var doubled = numbers.map(function(number){
	return number * 2
});