Translate Hooks FAQ

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• Overview
• Adoption Strategy
• • Which versions of React include Hooks?
• • Do I need to rewrite all my class components?
• • What can I do with Hooks that I couldn’t with classes?
• • How much of my React knowledge stays relevant?
• • Should I use Hooks, classes, or a mix of both?
• • Do Hooks cover all use cases for classes?
• • Do Hooks replace render props and higher-order components?
• • What do Hooks mean for popular APIs like Redux connect() and React Router?
• • Do Hooks work with static typing?
• • How to test components that use Hooks?
• • What exactly do the lint rules enforce?
• From Classes to Hooks
• • How do lifecycle methods correspond to Hooks?
• • How can I do data fetching with Hooks?
• • Is there something like instance variables?
• • Should I use one or many state variables?
• • Can I run an effect only on updates?
• • How to get the previous props or state?
• • Why am I seeing stale props or state inside my function?
• • How do I implement getDerivedStateFromProps?
• • Is there something like forceUpdate?
• • Can I make a ref to a function component?
• • How can I measure a DOM node?
• • What does const [thing, setThing] = useState() mean?
• Performance Optimizations
• • Can I skip an effect on updates?
• • Is it safe to omit functions from the list of dependencies?
• • What can I do if my effect dependencies change too often?
• • How do I implement shouldComponentUpdate?
• • How to memoize calculations?
• • How to create expensive objects lazily?
• • Are Hooks slow because of creating functions in render?
• • How to avoid passing callbacks down?
• • How to read an often-changing value from useCallback?
• Under the Hood
• • How does React associate Hook calls with components?
• • What is the prior art for Hooks?

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