Why React?
Methodical but exciting. This page answers every “but why not just use [X]?” question before it's asked.
Before React, building dynamic UIs was painful.
jQuery spaghetti, manual DOM manipulation, state scattered across files, and the chaos of keeping UI in sync with data.
// React — declarative & encapsulated
function LikeButton() {
const [count, setCount] = useState(0);
return (
<button onClick={() => setCount(c => c + 1)}>
❤️ {count}
</button>
);
}Live demo — click the button
React doesn't touch the DOM. Until it has to.
React keeps a lightweight copy in memory, diffs it against the real DOM, and makes surgical updates instead of re-rendering entire pages.
Virtual DOM
Real DOM
Build once. Use everywhere.
Reusable components, separation of concerns, composability, design systems — components make teams productive at scale.
Reusability
Write a component once and use it everywhere in your app. Change it in one place and every instance updates.
Composability
Build complex UIs by combining simple components like LEGO bricks. The possibilities are infinite.
Isolation
Each component manages its own state and lifecycle. Bugs stay contained, never cascading through your app.
Data flows down. Events bubble up. Nothing gets lost.
Props flow from parent to child. Events flow back up. React's one-way data flow eliminates unpredictable UI bugs.
Parent Component
Count: 0
Display Child
0
Action Child
How does React stack up?
Click any column header to sort. This table is a React component.
| Framework↑ | Learning Curve | Ecosystem | Job Market | Performance | Scalability | Mobile | SSR Support |
|---|---|---|---|---|---|---|---|
| Angular | Steep | Large | #2 | Good | Enterprise | Ionic | Angular Universal |
| React | Moderate | Massive | #1 | Excellent | Enterprise | React Native | Next.js / Remix |
| Svelte | Easy | Growing | #5 | Excellent | Small–Mid | Limited | SvelteKit |
| Vanilla JS | Easy | None | N/A | Varies | Varies | None | Manual |
| Vue | Easy | Large | #3 | Excellent | Mid–Large | Capacitor | Nuxt |