internal/baseFor.js

define(['./toObject'], function(toObject) {

  /**
   * The base implementation of `baseForIn` and `baseForOwn` which iterates
   * over `object` properties returned by `keysFunc` invoking `iteratee` for
   * each property. Iterator functions may exit iteration early by explicitly
   * returning `false`.
   *
   * @private
   * @param {Object} object The object to iterate over.
   * @param {Function} iteratee The function invoked per iteration.
   * @param {Function} keysFunc The function to get the keys of `object`.
   * @returns {Object} Returns `object`.
   */
  function baseFor(object, iteratee, keysFunc) {
    var index = -1,
        iterable = toObject(object),
        props = keysFunc(object),
        length = props.length;

    while (++index < length) {
      var key = props[index];
      if (iteratee(iterable[key], key, iterable) === false) {
        break;
      }
    }
    return object;
  }

  return baseFor;
});