lodash/internal/createBaseEach.js

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

  /**
   * Creates a `baseEach` or `baseEachRight` function.
   *
   * @private
   * @param {Function} eachFunc The function to iterate over a collection.
   * @param {boolean} [fromRight] Specify iterating from right to left.
   * @returns {Function} Returns the new base function.
   */
  function createBaseEach(eachFunc, fromRight) {
    return function(collection, iteratee) {
      var length = collection ? collection.length : 0;
      if (!isLength(length)) {
        return eachFunc(collection, iteratee);
      }
      var index = fromRight ? length : -1,
          iterable = toObject(collection);

      while ((fromRight ? index-- : ++index < length)) {
        if (iteratee(iterable[index], index, iterable) === false) {
          break;
        }
      }
      return collection;
    };
  }

  return createBaseEach;
});