2021-02-18
1598
#react
Adebola Adeniran
34347
Feb 18, 2021 â‹… 5 min read

React.memo vs. useMemo: Major differences and use cases

Adebola Adeniran Hi! I'm Adebola! I'm a full-stack React/Node.js and Ruby on Rails engineer from Nigeria. I mentor junior developers via the Google Developer Program, and I'm a regular contributor to some of the most widely read programming blogs. You can follow me on Twitter @debosthefirst.

Recent posts:

When is low-code the right choice? Here’s how to decide

Not sure if low-code is right for your next project? This guide breaks down when to use it, when to avoid it, and how to make the right call.

Popoola Temitope
Jul 11, 2025 â‹… 7 min read
Comparing AI App Builders — Firebase Studio vs. Lovable vs. Replit. LogRocket Article

Comparing AI app builders — Firebase Studio vs. Lovable vs. Replit

Compare Firebase Studio, Lovable, and Replit for AI-powered app building. Find the best tool for your project needs.

Emmanuel John
Jul 11, 2025 â‹… 7 min read
Gemini CLI tutorial — Will it replace Windsurf and Cursor?

Gemini CLI tutorial — Will it replace Windsurf and Cursor?

Discover how to use Gemini CLI, Google’s new open-source AI agent that brings Gemini directly to your terminal.

Chizaram Ken
Jul 10, 2025 â‹… 8 min read
React & TypeScript: 10 Patterns For Writing Better Code

React & TypeScript: 10 patterns for writing better code

This article explores several proven patterns for writing safer, cleaner, and more readable code in React and TypeScript.

Peter Aideloje
Jul 10, 2025 â‹… 11 min read
View all posts

2 Replies to "<code>React.memo</code> vs. <code>useMemo</code>: Major differences and use cases"

  1. Nice easy to read article. But I think you should make it clear that React.memo and useMemo are completely different: the functional component is always being rerendered, which is rexecuted with the same props, as can be seen from react tools/highlight rerenders (even though with no dom changes to perform to perform in this particular case).

  2. In your useMemo use case, does it mean no re-rendering if UseMemoCounts component shows the same times when clicking cheese buttons? ParentComponent sends the same value as a prop to UseMemoCounts. It just shows the same number and it keeps re-rendering, doesn’t it?

Leave a Reply