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/** * A specialized version of `_.reduce` for arrays without support for * iteratee shorthands. * * @private * @param {Array} [array] The array to iterate over. * @param {Function} iteratee The function invoked per iteration. * @param {*} [accumulator] The initial value. * @param {boolean} [initAccum] Specify using the first element of `array` as *  the initial value. * @returns {*} Returns the accumulated value. */function arrayReduce(array, iteratee, accumulator, initAccum) {  var index = -1,      length = array == null ? 0 : array.length;
  if (initAccum && length) {    accumulator = array[++index];  }  while (++index < length) {    accumulator = iteratee(accumulator, array[index], index, array);  }  return accumulator;}
module.exports = arrayReduce;