Switch forEach helper function

forEach.js

/*
   Foreach helper function
	  callback
		Function to execute for each element, taking three arguments:
		currentValue
			The current element being processed in the array.
		index
			The index of the current element being processed in the array.
		array
			The array that forEach() is being applied to.
*/
var forEach = function(array, callback){
	var currentValue, index;
	for (i = 0; i < array.length; i += 1) {
		currentValue = array[i];
		index = i;
		callback(currentValue, i, array);
    }
}