JavaScript fundamentals

iteration.js

// Array Iteration:
myArray = [ 'foo' ];
myArray.forEach(function(x) { console.log(x); });
// prints "foo"

// Object Keys:
myObject = { foo: 'bar', baz: 'quux' };
Object.keys(myObject); // [ "foo", "baz" ]

// Object Iteration Helper (context is optional)
function objectIteration(obj, fn, context) {
  Object.keys(obj).forEach(function(key) {
    fn.call(context, key, obj[key]);
  });
}