React usestate

Usestate hook

import React, { useState } from 'react';

function Example() {
  // Declare a new state variable, which we'll call "count"  
  const [count, setCount] = useState(0);
  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

Source: reactjs.org

React useEffect

import React, { useEffect } from 'react';

export const App: React.FC = () => {
  
  useEffect(() => {
        
  }, [/*Here can enter some value to call again the content inside useEffect*/])
  
  return (
    <div>Use Effect!</div>
  );
}

Prevstate in usestate

const [prevState, setState] = React.useState([]);

setState(prevState => [...prevState, 'somedata'] );

Usestate in react

  const [x, setx] = useState(0);

Source: reactjs.org

Usestate react

import React, { useState } from 'react';

function Example() {
	
  const [count, setCount] = useState(0);
  
  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

Source: reactjs.org

React useState hook

 1:  import React, { useState } from 'react'; 2:
 3:  function Example() {
 4:    const [count, setCount] = useState(0); 5:
 6:    return (
 7:      <div>
 8:        <p>You clicked {count} times</p>
 9:        <button onClick={() => setCount(count + 1)}>10:         Click me
11:        </button>
12:      </div>
13:    );
14:  }

Source: reactjs.org

Similar codes

0 vote356 views1 answer
React native pure component vs component
Javascript React
9 votes362 views2 answers
Reactjs radio button onchange
Javascript React
0 vote376 views1 answer
How to get key from a button in react
Javascript React
1 vote355 views1 answer
React does not recognize the `activeClassName` prop on a DOM element
Javascript React
0 vote363 views1 answer
React js marked import and use
Javascript React
0 vote361 views1 answer
Comming soon page in react
Javascript React
32 votes393 views1 answer
How to do routes react js
Javascript React
0 vote348 views1 answer
Only numbers or string. Input field in React
Javascript React
16 votes376 views2 answers
Where to put background images in react app
Javascript React
3 votes366 views2 answers
React usestate functional update
Javascript React