/**

* 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;