replaces for loop with each function

each.js

/* how do you encapsulate a for loop within a function
so that each(names, callback) will do the same thing as the for loop? */

// ensure that the all inputs are explicity declared in function signature
var each = function(array, callback) {
  for (var i = 0; i < array.length; i++) {
    callback(array[i]);
  }
};

each(names, log); // console logs each item in array without creating a variable named i in global namespace

each([1, 2, ])