shared · easy

PascalCase

Identifiers that capitalize every word including the first — e.g. UserProfile, HttpClient.

Where you see it

Used for React components, classes, TypeScript types/interfaces, and many framework constructors. File names for components often match the export (UserCard.tsx).

Why it matters

In React, lowercase tags are DOM elements and PascalCase tags are components — getting this wrong is a classic beginner bug.

Interview angle

Expect questions like “why must this component start with a capital letter?” or how you’d name a shared UI kit export.

Tags: naming, javascript, typescript, react