React Hooks & Context API

Hooks:

React Hooks: Hooks area unit is the new feature introduced within React sixteen.8 version. It permits you to use state and different React options while not writing a category. A hook is a unit that performs "hook into" React state and lifecycle options from function elements. It doesn't work within categories.

Hooks area unit backward-compatible, which implies it doesn't contain any breaking changes. Also, it doesn't replace your information on React ideas.

When to use a react hook: If you write an operating part, and so you wish to feature some state thereto, antecedently you are doing this by changing it to a category. But currently, you'll get laid by employing a Hook within the prevailing operating part.

Rules of react hooks: Hooks are kind of like JavaScript functions; however, you wish to follow these 2 rules once exploiting them. Hooks rule ensures that each one the stateful logic during an element is visible in its ASCII text file. These rules are

Prerequisites for React Hooks:

Node version 6 or above

NPM version 5.2 or above

Create-react-app tool for running the React App

2. Only call Hooks from React functions

You cannot decide Hooks from regular JavaScript functions. Instead, you'll be able to decide Hooks from React perform parts. Hooks can even be known as custom Hooks’-requisites for React Hooks:

Node version 6 or above

NPM version 5.2 or above

Create-react-app tool for running the React App

React Hooks Installation:

To use React Hooks, use this command

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The above command will install the latest React and React-DOM alpha versions which support React Hooks. Make sure the package.json file lists the React and React-DOM dependencies as given below.

Context API:

What is context API: The React Context API may be a method for a React app to effectively manufacture world variables which will be passed around. This can be the choice to "prop drilling" or moving props from forebear to kid to parent, and so on. Context is additionally touted as a neater, lighter approach to state management victimization revived.

Context API may be a (kind of) new feature superimposed in version sixteen.3 of React that permits one to share state across the complete app (or a part of it) gently and with ease.

How it works: React.createContext() is all you would like. It returns a shopper and a supplier. supplier may be a part that as its name suggests provides the state to its youngsters. it'll hold the "store" and be the parent of all the parts which may like that store. shopper because it, therefore, maybe a part that consumes and uses the state. additional data may be found on Reacts documentation page

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How to use context API: You might assume to yourself: "Well, I am convinced. However, do I implement the Context API in my app?" 1st, ensure you wish for it. Generally, individuals use shared states across nested elements rather than simply passing them as props. And if you are doing want it you must follow these only a few steps:

1. Create a folder under your app root named contexts (not required. just a convention)

2. Create a file named <your context name>Context.js, e.g., userContext.js

3. Import and create a context

4. Create a component that will wrap the provider named Provider e.g. UserProvider

5. Create a higher-order component to consume the context named: with e.g. with user

6. Finally export them

7. And use them