Use effect react

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>
  );
}

Useeffect with cleanup

  useEffect(() => {
	//your code goes here
    return () => {
      //your cleanup code codes here
    };
  },[]);

Componentwillunmount hooks

useEffect(() => {
  window.addEventListener('mousemove', () => {});

  // returned function will be called on component unmount 
  return () => {
    window.removeEventListener('mousemove', () => {})
  }
}, [])

Source: stackoverflow.com

Use effect react

import React, { useState, useEffect } from 'react';
function Example() {
  const [count, setCount] = useState(0);

  useEffect(() => {    document.title = `You clicked ${count} times`;  });
  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

Source: reactjs.org

Similar codes

0 vote210 views1 answer
React this.state.selectedDays.toLocaleDateString is not a function
Javascript React
0 vote163 views1 answer
'{ state: any; dispatch: React.Dispatch<{ type: string; payload: any; }>; }' is not assignable to type 'Store'
Javascript React
0 vote168 views1 answer
How to use algolia react native
Javascript React
2 votes195 views4 answers
Can't perform a React state update on an unmounted component
Javascript React
0 vote207 views1 answer
Convert table to excel reactjs
Javascript React
113 votes189 views6 answers
React app
Javascript React
12 votes222 views3 answers
Get value of input react
Javascript React
4 votes239 views2 answers
Defining functions in react
Javascript React
6 votes219 views2 answers
How do I conditionally add attributes to React components?
Javascript React
0 vote218 views2 answers
How to give data from react native to webview
Javascript React