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Clarify conflicting advice

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Dan Abramov
2019-01-17 13:25:41 +00:00
parent d7d5533278
commit 1a49812370
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content/docs/hooks-faq.md
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@@ -156,7 +156,7 @@ If we just wanted to set an interval, we wouldn't need the ref (`id` could be lo
// ...
```
Conceptually, you can think of refs as similar to instance variables in a class. Avoid setting refs during rendering -- this can lead to surprising behavior. Instead, only modify refs in event handlers and effects.
Conceptually, you can think of refs as similar to instance variables in a class. Unless you're doing [lazy initialization](#how-to-create-expensive-objects-lazily), avoid setting refs during rendering -- this can lead to surprising behavior. Instead, typically you want to modify refs in event handlers and effects.
### Should I use one or many state variables?