Answers for "react hook useeffect"

Javascript

react useEffect

// Every rerender
useEffect(() => {
	console.log("I run everytime this component rerenders")
});

// onMount
useEffect(() => {
	console.log("I Only run once (When the component gets mounted)")
}, []);

// Condition based 
useEffect(() => {
	console.log("I run everytime my condition is changed")
}, [condition]);

// Condition based with "clean up"
useEffect(() => {
	console.log("I run everytime my condition is changed")
	
	return () => {
    	console.log("Use this return as a 'clean up tool' (this runs before the actual code)")
    }
}, [condition]);

Posted by: Guest on October-07-2021

useeffect

function App() {
  const [count, setCount] = useState(0);

  useEffect(() => {
    longResolve().then(() => {
      alert(count);
    });
  }, []);

  return (
    <div>
      <button
        onClick={() => {
          setCount(count + 1);
        }}
      >
        Count: {count}
      </button>
    </div>
  );
}

Posted by: Guest on March-19-2020

Source

what is useeffect

useEffect is a hook for encapsulating code that has 'side effects,' and is like a combination of componentDidMount , componentDidUpdate , and componentWillUnmount . Previously, functional components didn't have access to the component life cycle, but with useEffect you can tap into it.23.1.2019

Posted by: Guest on May-19-2021

useeffect react

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

Posted by: Guest on January-20-2021

how to use useeffect

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

  // Similar to componentDidMount and componentDidUpdate:  
  useEffect(() => {    
  	// Update the document title using the browser API    
  	document.title = `You clicked ${count} times`;  
  });
  
  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

Posted by: Guest on August-23-2020

Source

react hook useeffect

//This is a basic example, carefully read the docs as
//useEffect it's like componentDidMount/WillUnmount
function Example() {
  const [count, setCount] = useState(0);

  // Similar to componentDidMount and componentDidUpdate:
  useEffect(() => {
    // Update the document title using the browser API
    document.title = `You clicked ${count} times`;
  });
  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

Posted by: Guest on April-03-2020

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