What is the difference between slice and splice in JavaScript?

Slice returns a new array copy without changing the original; splice modifies the array in place, allowing inserts/deletes.

How does push differ from unshift in JavaScript arrays?

Push adds to the end (fast, O(1)); unshift adds to the start (slower, O(n) due to shifting elements).

Why use indexOf over includes for JavaScript arrays?

IndexOf gives the position (-1 if not found); includes just returns true/false — use indexOf when you need the index.

🌐 Frontend & Web

JavaScript Array Methods: The Quiet Backbone of Every Web App You Use

Stuck debugging a mangled data list in your app? JavaScript array methods like splice and slice are your lifeline, turning chaos into clean code overnight. Here's why pros swear by them.

theAIcatchup Apr 08, 2026 4 min read

JavaScript code snippet demonstrating array methods like push, pop, and splice on a fruits array

⚡ Key Takeaways

Master push/pop/shift/unshift for fast array mutations, but watch O(n) costs on large lists. 𝕏
Slice for safe copies; splice for in-place edits — key to avoiding React re-render bugs. 𝕏
JS arrays' dynamic nature stems from these methods, fueling the shift to functional paradigms. 𝕏

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