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wtf is react?

skevy/react — explained in plain English

Analysis updated 2026-07-17 · repo last pushed 2015-09-26

JavaScriptAudience · developerComplexity · 2/5DormantSetup · easy

TL;DR

A JavaScript library that lets you declare what a webpage's UI should look like, then automatically updates the screen when data changes.

Mindmap

mindmap
  root((react))
    What it does
      Declarative UI updates
      Virtual DOM diffing
      One-way data flow
    Tech stack
      JavaScript
      JSX
      Virtual DOM
    Use cases
      Add a live search box
      Build single-page apps
      Power mobile apps via React Native
    Audience
      Web developers
      Teams building interactive sites

Code map

Detail Auto

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filefunction / class

Why would anyone build with this?

REASON 1

Add interactive elements like a live search box or shopping cart to an existing site.

REASON 2

Build a single-page app that updates without full page reloads.

REASON 3

Share UI logic with mobile apps through React Native.

What's in the stack?

JavaScriptJSXReact Native

How it stacks up

skevy/reacta15n/a15na15n/checkout-validation
LanguageJavaScriptJavaScriptJavaScript
Last pushed2015-09-262019-04-072014-09-04
MaintenanceDormantDormantDormant
Setup difficultyeasyeasyeasy
Complexity2/52/52/5
Audiencedevelopergeneraldeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · easy Time to first run · 5min

Can be included via CDN for quick starts or npm for larger projects.

Yoink these prompts

Prompt 1
Show me a basic React component that updates its display when a button is clicked.
Prompt 2
Explain how React's Virtual DOM decides what to update on screen.
Prompt 3
Write a simple React shopping cart component using JSX.

Frequently asked questions

wtf is react?

A JavaScript library that lets you declare what a webpage's UI should look like, then automatically updates the screen when data changes.

What language is react written in?

Mainly JavaScript. The stack also includes JavaScript, JSX, React Native.

Is react actively maintained?

Dormant — no commits in 2+ years (last push 2015-09-26).

How hard is react to set up?

Setup difficulty is rated easy, with roughly 5min to a first successful run.

Who is react for?

Mainly developer.

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