function each(object, callback) {
  var item;

  if (object.length != null) {
   // for array with an empty string in it, the conditional causes iteration to stop at the empty string
    for (var i = 0; i < object.length; i++) {
      callback(object[i], i);
    }
  } else {
    for (var key in object) {
      if (object.hasOwnProperty(key)) {
        callback(object[key], key);
      }
    }
  }
}