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React 19

Frontend Developer

React 19 questions

5 questions on React 19 for frontend developers, easiest first.

Medium 2

useFormStatus always says not pendingmedium
Showing a form action’s resultmedium

Hard 3

use() that suspends foreverhard
Passing a ref to a function componenthard
Cleanup from a ref callbackhard

More Frontend Developer skills

HTML and CSS 186 Web performance and tooling 180 JavaScript and TypeScript 172 React 141 Performance and debugging 62 Mobile app development 50 Accessibility 33 Hooks 27 Databases and caching 21 Interaction design and IA 19 Core Web Vitals 17 Web application security 16 Arrays and strings 14 Fonts 14 Graphics and rendering 14 UI automation (Playwright, Selenium) 12 Main Thread 12 Test automation frameworks 9 Analytics and attribution 9 Grid 9 Selectors 8 Animations 8 Functions 8 Strict Mode 8

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