Quicksort

ARRAY

SORTING

### Problem

Implement the quicksort algorithm to sort an array of integers in ascending order. The function quickSort should take an array of integers as input and return a new array containing the sorted integers.

This is how it works:

- Select a pivot element from the array. You can choose the pivot in various ways, such as picking the first element, the last element, or a random element.
- Partition the array into two sub-arrays: elements less than the pivot and elements greater than the pivot.
- Recursively apply the above steps to the sub-arrays.
- Combine the results of the sub-arrays and the pivot to form the sorted array.

### Examples:

`quickSort([9,4,7,3,5,8,1,6,2]) // returns [1,2,3,4,5,6,7,8,9]`

### Time Complexity

Average Case: `O(n log n)`

Worst Case: `O(n^2)`

, occurs when the smallest or largest element is always chosen as the pivot.

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