code: function _eachArray(arry, fn, reverse) {
    if (reverse === true) {
      return _eachArrayReverse(arry, fn)
    } else {
      return _eachArrayForward(arry, fn)
    }
  }
docs: If reverse is true, calls _eachArrayReverse(arry, fn)
  otherwise calls _eachArrayForward(arry, fn)
  @param {Array.<*>} arry
  @param {eachCallback} fn
  @param {boolean} [reverse=false] - whether to iterate
  through the array in reverse order.
  @returns {boolean} - whether the loop broke early
  @private