1 var arraySlice = require('../internals/array-slice-simple');
3 var floor = Math.floor;
5 var mergeSort = function (array, comparefn) {
6 var length = array.length;
7 var middle = floor(length / 2);
8 return length < 8 ? insertionSort(array, comparefn) : merge(
10 mergeSort(arraySlice(array, 0, middle), comparefn),
11 mergeSort(arraySlice(array, middle), comparefn),
16 var insertionSort = function (array, comparefn) {
17 var length = array.length;
24 while (j && comparefn(array[j - 1], element) > 0) {
25 array[j] = array[--j];
27 if (j !== i++) array[j] = element;
31 var merge = function (array, left, right, comparefn) {
32 var llength = left.length;
33 var rlength = right.length;
37 while (lindex < llength || rindex < rlength) {
38 array[lindex + rindex] = (lindex < llength && rindex < rlength)
39 ? comparefn(left[lindex], right[rindex]) <= 0 ? left[lindex++] : right[rindex++]
40 : lindex < llength ? left[lindex++] : right[rindex++];
44 module.exports = mergeSort;