Function swap

src/searching/quickselect.js:26–30

(arr, i, j)

  function quickselect(arr, n, lo, hi) {
    function partition(arr, lo, hi, pivotIdx) {
      function swap(arr, i, j) {
        var temp = arr[i];
        arr[i] = arr[j];
        arr[j] = temp;
      }
      var pivot = arr[pivotIdx];
      swap(arr, pivotIdx, hi);
      for (var i = lo; i < hi; i += 1) {