code: function arrayReduceRight(array, iteratee, accumulator, initAccum) {
        var length = array.length;
        if (initAccum && length) {
          accumulator = array[--length];
        }
        while (length--) {
          accumulator = iteratee(accumulator, array[length], length, array);
        }
        return accumulator;
      }
docs: A specialized version of `_.reduceRight` 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 last element of `array` as the initial value.
  @returns {*} Returns the accumulated value.