🧒 Explain like I'm 5
Imagine you're building with LEGOs and you put several pieces on the board at once instead of one at a time. React 18 does that with updates—it groups them together so the screen doesn't flicker. Sometimes you need to see each piece go down immediately, and that's when you use a special tool called flushSync.
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Senior-level deep dive: internals, pitfalls, and a self-interview ladder.
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