JavaScriptAlgorithms/Sort/Double Way Quick Sort.html at master · biaodigit/JavaScriptAlgorithms · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="SortTestHelper.js"></script>
</head>
<body>
<script>
    function DoubleWayQuickSort(arr) {
        let len = arr.length
        _quickSort(arr, 0, len - 1)
        console.log(arr)
    }

    function _quickSort(arr, l, r) {
        if (l >= r) {
            return
        }

        let p = _partition(arr, l, r);
        _quickSort(arr, l, p - 1);
        _quickSort(arr, p + 1, r)
    }

    function _partition(arr, l, r) {
        let v = arr[l],
            i = l + 1,
            j = r;
        while (true) {
            while (i <= r && arr[i] < v) {
                i++
            }
            while (j >= l && arr[j] > v) {
                j--
            }

            if(i > j) break;
            swap(arr, i, j);
            i++;
            j--;
        }
        swap(arr, l, j);
        return j
    }
    DoubleWayQuickSort([3, 1, 3, 5, 4, 4, 4, 7, 2, 4, 9, 4, 4, 6, 10, 8])
</script>
</body>
</html>