Скачать или смотреть React Hooks Tutorial - 3 - useState with Array

What is a Hook?
A Hook is a special function that lets you “hook into” React features. For example, useState is a Hook that lets you add React state to function components. We’ll learn other Hooks later.

When would I use a Hook?
If you write a function component and realize you need to add some state to it, previously you had to convert it to a class. Now you can use a Hook inside the existing function component.

What is useState hook ?

useState is a Hook that allows you to have state variables in functional components. You pass the initial state to this function and it returns a variable with the current state value (not necessarily the initial state) and another function to update this value.

This tutorial serves as a complete guide to the useState Hook in React, the equivalent of this.state/this.setSate for functional components
Declaration :
import React, { useState } from 'react';
Syntax:
const [variable ,function]=useState(initialValue)

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