Function shellsort

utils.js:6694–6702

(arr, fn)

}

function shellsort(arr, fn) {
	var length = arr.length;
	var gapSize = Math.floor(length / 2);
	while(gapSize) {
		_shellInsertionSort(arr, length, gapSize, fn);
		gapSize = Math.floor(gapSize / 2);
	}
	return arr;
}

function EventEmitter2(obj) {
	if (obj) {