function arrayReduce(array, iteratee, accumulator, initFromArray) {
	      var index = -1,
	          length = array.length;

	      if (initFromArray && length) {
	        accumulator = array[++index];
	      }
	      while (++index < length) {
	        accumulator = iteratee(accumulator, array[index], index, array);
	      }
	      return accumulator;
	    }
A specialized version of `_.reduce` for arrays without support for callback
shorthands and `this` binding.

@private
@param {Array} array The array to iterate over.
@param {Function} iteratee The function invoked per iteration.
@param {*} [accumulator] The initial value.
@param {boolean} [initFromArray] Specify using the first element of `array`
 as the initial value.
@returns {*} Returns the accumulated value.