いつなぜuseEffectを使うべきか？

| This example highlights the importance of understanding when useEffect should be used. useEffect is for triggering code in response to the screen updating, not for triggering code in response to an event, such as a user interaction.

参考

https://medium.com/redsquirrel-tech/improve-your-knowledge-of-reacts-useeffect-with-5-exercises-361c2c2fcf4e

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