define(function () {

  // Internal helper that wraps an `iteratee` to call it with the
  // property of a closed-over `object`. Useful when iterating over
  // an array of keys of `object`.
  function applyProperty(iteratee, object) {
    return function(key) {
      return iteratee(object[key], key, object);
    };
  }

  return applyProperty;

});