Eloquent JS - Functions // source http://jsbin.com/diteto/11

jsbin.diteto.js

function forEach(array, action) { 
  for(var i = 0; i < array.length;i++) {
    action(array[i]);
  }
 
}

function sum(numbers) {
  
  var total = 0;
  forEach(numbers, function (number){
    total += number;
    console.log("Running Total: " + total);
  });
  
  return total;  
}

var a = [1, 2, 3];


console.log(sum(a));