Why Quick Sort is so fast?

#quicksort #dsa #algorithms #javascript #sortingalgorithm #programming Quick Sort is one of the fastest sorting algorithms ever created — but why? In this video, we’ll deeply understand and implement quick sort and see how Quick Sort actually works, why CPUs love it, how pivot selection changes everything, and why this algorithm can perform as both O(n²) and O(n log n) depending on partitioning. We’ll cover: • Implementation of quick sort in JavaScript • Partitioning step-by-step • Pivot selection strategies • Worst case vs best case • Time & space complexity • Why Quick Sort often beats Merge Sort in practical use This tutorial is explained step-by-step for DSA beginners and interview preparation. ⏮️Previous Episode: https://youtu.be/xkKJ60B7d8s 📃Full Series: https://www.youtube.com/playlist?list=PLQWOOhLsUv1JC8ieumWYDqz0fnjq90K90 Timestamps⌚: 00:00 - Intro(What is quick sort?) 01:00 - Manual run through an array to understand mental model of quick sort 06:22 - Implementing Quick Sort (Lomuto version) in JavaScript 19:03 - Why CPUs love quick sort? 20:06 - is Quick Sort stable? 20:36 - Time and Space complexity of Quick Sort 21:49 - Array partition decides the time and space complexity of Quick Sort from O(n^2) to O(n log(n)) 28:40 - Lomuto version vs Hoare's Version 29:21 - Deep analysis of Quick Sort by debugging it