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Analysis of a quick sort function

This article is used to record the understanding of the quick queue, which is convenient for recall function quickSort(arr, left, right) {//left right var len = arr.length, partitionIndex, left = typeof left != 'number' ? 0 : left, right = typeof right != 'number' ? len - 1 : right;// if (left < right) {// partitionIndex = partition(arr, left, right);// quickSort(arr, left, partitionIndex - 1);// partitionIndex - 1 quickSort(arr, partitionIndex + 1, right);// } return arr; } function partitio