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JavaScript's functional programming helper library.

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define(['./_cb', './keys'], function (_cb, keys) {

  // Returns the results of applying the `iteratee` to each element of `obj`.
  // In contrast to `_.map` it returns an object.
  function mapObject(obj, iteratee, context) {
    iteratee = _cb(iteratee, context);
    var _keys = keys(obj),
        length = _keys.length,
        results = {};
    for (var index = 0; index < length; index++) {
      var currentKey = _keys[index];
      results[currentKey] = iteratee(obj[currentKey], currentKey, obj);
    }
    return results;
  }

  return mapObject;

});