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

65 votes221 views6 answers
React routing
Javascript React
113 votes270 views6 answers
How to create a new react app
Javascript React
1 vote273 views1 answer
React native detect production
Javascript React
0 vote241 views2 answers
React tweet embed
Javascript React
0 vote267 views1 answer
Custom hook for unique items in react
Javascript React
2 votes232 views1 answer
View background image in react native
Javascript React
1 vote259 views2 answers
History react router
Javascript React
0 vote275 views1 answer
React Fractional rating
Javascript React
17 votes244 views5 answers
React native background image
Javascript React
0 vote243 views2 answers
Change iphone return in keyboard to search in react native
Javascript React