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I just read about the react's new feature hooks.Read about hooks but i can't able to use it. it gives me error.
I am currently using version 16.6.0
Finally i got Understand the hooks.
import React, {useState} from 'react';
const Fun = () => {
const [count, setCount] = useState(0);
return (
<div>
<p>You clicked {count} times</p>
<button onClick={() => setCount(count + 1)}>
Click me
</button>
</div>
);}
export default Fun;
I imported as Fun and used as in my app.js file
The mistake i made is i did't install React v16.7.0-alpha so i installed using npm add react@next react-dom@next.
Thank you
880
To update the state, call the state updater function with the new state setState(newState) . Alternatively, if you need to update the state based on the previous state, supply a callback function setState(prevState => newState) .
The answer: They're just queues setState , and React. useState create queues for React core to update the state object of a React component. So the process to update React state is asynchronous for performance reasons. That's why changes don't feel immediate.
You can have multiple useEffects in your code and this is completely fine! As hooks docs say, you should separate concerns. Multiple hooks rule also applies to useState - you can have multiple useState in one component to separate different part of the state, you don't have to build one complicated state object.
You can't use a hook inside another hook because it breaks the rule Call Hooks from React function components and the function you pass to useEffect is a regular javascript function. What you can do is call a hook inside another custom hook.
EDIT:
Hooks are released as a part of version 16.8.0 and you can use it by installing React and React-dom 16.8.0
run
yarn install [email protected] [email protected]
to install. In order to upgrade react to latest version
yarn upgrade react react-dom
Hooks aren't present in version 16.6.0, but are a proposal for version 16.7.0. You can however use 16.7.0-alpha.0 alpha version of React to test them
In order to use this install the above version using
yarn add react@next react-dom@next
Make sure that you install both react and react-dom or else your would get warning like
TypeError: Object(…) is not a function” error when trying to use react hooks (alpha)
84
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