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- 'use strict';
- var arraySlice = require('../internals/array-slice');
- var floor = Math.floor;
- var sort = function (array, comparefn) {
- var length = array.length;
- if (length < 8) {
- // insertion sort
- var i = 1;
- var element, j;
- while (i < length) {
- j = i;
- element = array[i];
- while (j && comparefn(array[j - 1], element) > 0) {
- array[j] = array[--j];
- }
- if (j !== i++) array[j] = element;
- }
- } else {
- // merge sort
- var middle = floor(length / 2);
- var left = sort(arraySlice(array, 0, middle), comparefn);
- var right = sort(arraySlice(array, middle), comparefn);
- var llength = left.length;
- var rlength = right.length;
- var lindex = 0;
- var rindex = 0;
- while (lindex < llength || rindex < rlength) {
- array[lindex + rindex] = (lindex < llength && rindex < rlength)
- ? comparefn(left[lindex], right[rindex]) <= 0 ? left[lindex++] : right[rindex++]
- : lindex < llength ? left[lindex++] : right[rindex++];
- }
- }
- return array;
- };
- module.exports = sort;
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