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What is the difference between computed and watch?

Q: What is the difference between computed and watch?

**computed** returns a cached, derived value that recomputes only when its dependencies change — use it for values derived from state. **watch**/`watchEffect` runs side effects in response to changes (API calls, logging). Rule of thumb: derive values with `computed`, perform actions with `watch`.

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When to use computed vs watchers.

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computed returns a cached, derived value that recomputes only when its dependencies change — use it for values derived from state. watch/watchEffect runs side effects in response to changes (API calls, logging). Rule of thumb: derive values with computed, perform actions with watch.

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