Daily Software Tips & Tricks

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Mastering React's Dependency Array

February 6, 2026

A quick tip for cleaning up your React `useEffect` warnings: If you define a helper function inside your component and call it within `useEffect`, ESLint will insist you include that function in the dependency array. While you *could* ignore it, a better pattern is to wrap that function definition in `useCallback`. This tells React the function reference only changes when its own dependencies change, preventing unnecessary re-runs of your effect and keeping your component performant and predictable. It’s a key step toward stable hook usage.