Function _shellInsertionSort

utils.js:6681–6692

(list, length, gapSize, fn)

// =============================================

function _shellInsertionSort(list, length, gapSize, fn) {
	var temp, i, j;
	for (i = gapSize; i < length; i += gapSize ) {
		j = i;
		while(j > 0 && fn(list[j - gapSize], list[j]) === 1) {
			temp = list[j];
			list[j] = list[j - gapSize];
			list[j - gapSize] = temp;
			j -= gapSize;
		}
	}
}

function shellsort(arr, fn) {
	var length = arr.length;