![]() We’ve already seen that React is picky about when it’s okay to call Hooks. I know what you are thinking: “isn’t that just what functions are for? Why do we need Hooks to do that?” Well, there’s one more Hook rule: Why are Custom Hooks Useful?Ĭustom Hooks should be used when you notice yourself doing the same thing over and over again in different components. Hooks need to be called in the same order each time a component renders, so our calls have to stay outside of any program flow controls, like if statements. It’s important that custom Hooks follow the useHook naming convention because it allows React tooling to ensure you’re following all the rules of Hooks and tells other developers what they’re dealing with.Ĭalling Hooks at the “top level” just means that we’re not doing it inside of loops, conditions, or nested functions. Only calls other Hooks at the top level. ![]() React Documentation What is a “Custom Hook?”Ī custom Hook is really just a reusable function that follows the rules of Hooks: But, did you know that React gives us a way to write our own, custom Hooks? Let’s take a look at the “what,” “how,” and “why” of writing our own Hooks.īuilding your own Hooks lets you extract component logic into reusable functions. ![]() You’ve probably heard of React Hooks at this point, and hopefully, you’re familiar with the basics like useState and useEffect.
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