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Editor's pickLearn to add React keyboard shortcuts with clean listener setup, editable-field safeguards, modifier checks, conflict guidance, and keyboard-only testing.
Learn when React useMemo vs useCallback helps, how dependencies and referential equality work, and when memoization adds needless complexity in real components.
Learn how to fix React useEffect infinite loops by checking dependencies, object and function identity, state updates, and effect cleanup.
Find unused JavaScript with Next.js bundle analysis and Chrome DevTools, then use dynamic imports, tree shaking, and smaller client boundaries to reduce bundle size.
Mock fetch() in JavaScript unit tests with Jest. Test successful responses, HTTP failures, rejected requests, cleanup, and Node.js versus browser environments.
Fix CORS errors between Next.js and Express with exact origin settings, preflight handling, allowed headers, and credentialed request examples.