How to use useState Hook in React.js

published on 8/16/2021

Hooks were introduced in React version 16.8. In order to replace the conventional this.state in Class component.

Steps of Using `useState` Hook

Step 1

We need to import the Hook from react

import { useState } from "react";

Step 2

Declare a const variable and assign the useState function as follow

// conventional way to use sate
const [state, setState] = useState(InitialState);

Step 3

How to set state and use state, The useState Hook returne's two parameters one to set the state and the other to get the state value.

import React, { useState } from 'react';

function Example() {
  // Declare a new state variable, which we'll call "name"
  const [name, setName] = useState("");

  return (
    <div>
      {name&&<p>You {Name}</p>)
      <label for="name">name:</label>
      <input type="text" id="name" name="name" value={name}
        onChange={()=>setName(e.target.value)}/>
    </div>
  );
}

Traditional ways of using state, This method is a bit tricky use a the beginning, Becouse it has the key word this that make thing complex

class Example extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      name: ""
    };
  }

  render() {
    return (
      <div>
        {name&&<p>You {Name}</p>)
        <label for="name">name:</label>
        <input type="text" id="name" name="name" value={this.state.name}
        onChange={()=>this.setState({name:e.target.value})}/>
      </div>
    );
  }
}

How to use useState Hook in React.js

Steps of Using useState Hook

Step 1

Step 2

Step 3

Steps of Using `useState` Hook