React Hooks - How to use a make a state dependant on another state?

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You can use a useEffect hook. The 1st argument is a function and the 2nd argument is an array of dependencies. When a dependency changes value, the function is executed again.,In this exemple the filters work fine, but their value are not emptied when we use the button Reset.,Making statements based on opinion; back them up with references or personal experience.

You can use a useEffect hook. The 1st argument is a function and the 2nd argument is an array of dependencies. When a dependency changes value, the function is executed again.

import {
   useEffect
} from 'react';

// ....code removed....

useEffect(() => {
   setTempValue(value);
}, [value]);

// ....code removed....
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Hooks are a new addition in React 16.8. They let you use state and other React features without writing a class.,React guarantees that dispatch function identity is stable and won’t change on re-renders. This is why it’s safe to omit from the useEffect or useCallback dependency list.,React guarantees that setState function identity is stable and won’t change on re-renders. This is why it’s safe to omit from the useEffect or useCallback dependency list.

const [state, setState] = useState(initialState);
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How To Manage State with Hooks on React Components , How To Manage State on React Class Components , How To Share State Across React Components with Context

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65%

Using an object as a state variable with useState hook, Class and functional components in React What does the React.useState hook do? Declaring state in React React Hooks: Update state Using an object as a state variable with useState hook How to update state in a nested object in React with Hooks Multiple state variables or one state object Rules for using useState The useReducer Hook ,React finds another call to useState and repeats the actions of the previous step, storing a new Hook object and changing the current Hook variable

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React has updated the state value. The component needs the latest value.,The component passes this value to useState. React sets the state value to this initial value when the component first runs.,The component passes the initial value to the useState function. React sets the current value for that useState call from that component.

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So for this article, we will be working with a pattern for managing state using two very important Hooks, useContext and useReducer, to build a simple music gallery app. The application will have only two views: one for login and the other to list the songs in that gallery.,useReducer — This is an alternative to useState and it can be used for complex state logic. This is my favorite hook because it works just like the Redux library. It accepts a reducer of type:,Based on that article, a lot (two actually) of people asked questions related to how State can be managed in a React application using just Context and Hooks, which led to me doing a little research on the subject.

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First, we see how to do this with a class-based component using setState:,Now, let's see how to do the same thing with Hooks, using a functional component:,Let's see the code for the class-based component:

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Introducing the Hooks API provides a lot of functionality in your functional components. The useEffect hook allows you to handle side effects such as logging, making asynchronous calls, or setting values on local storage. The useState hook lets you give state to your functional components, which wasn't possible before unless you used a class component. A later guide will cover more hook functionality, including how to create your own custom hooks., When you must perform side effects in a functional component, you can use the helpful useEffect hook. ,When using the useEffect hook, it's common to compare it to all of the class component lifecycle methods. Instead, you should think of the useEffect hook in terms of how you want your state to look after certain variables change.

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import React from 'react';
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function BooksList() {
   4
   const [books, updateBooks] = React.useState([]);
   5
}
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React Hooks have quickly become the recommended way to handle component local state and side effects in React function components. Getting started with hooks is quite straightforward, but you might need to change the way you think about your components, especially when it comes to the useEffect hook.,This blog assumes you know the basics of React Hooks – if you don’t you can find out more here – and will dive a bit deeper into how they should be used. I’ll also be sharing a bit about the mistakes we made and how it took us nearly a month to fix the mess.,If you want to learn more about hooks and the rules of hooks, React’s official docs are amazing – they explain the rules and why you have to follow them. If I had read them to start with I wouldn’t have made the mistakes I did! I’d also recommend taking a look at Dan Abramov’s blog, overreacted.io. A complete guide to useEffect is interesting, as is React as a UI Runtime, and how are function components different from classes will teach you some important differences.

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