🧒 Explain like I'm 5
Imagine you're building with LEGOs and your friend asks for a brick while you're in the middle of a big tower. Instead of stopping everything, you say 'just a sec' and finish your tower first. useTransition is like that 'just a sec' for React—it lets important updates (like typing) finish before less important ones (like showing search results) start, and isPending tells you when to show a spinner.
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Senior-level deep dive: internals, pitfalls, and a self-interview ladder.
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