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React useCallback Hook

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naly moslih answered on August 26, 2021 Popularity 10/10 Helpfulness 2/10

answer React useCallback Hook

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React useCallback Hook

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//todos.js
import { memo } from "react";

const Todos = ({ todos, addTodo }) => {
  console.log("child render");
  return (
    <>
      <h2>My Todos</h2>
      {todos.map((todo, index) => {
        return <p key={index}>{todo}</p>;
      })}
      <button onClick={addTodo}>Add Todo</button>
    </>
  );
};

export default memo(Todos);

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: hook javascript react-usecallback

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Contributed on May 24 2022

naly moslih

0 Answers Avg Quality 2/10

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usecallback in react

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//useCallback is hook that return memorized version of callback function
//only changes when one of dependency is changed
import {useState,useCallback} from 'react'
const [increment,setIncrement]=useState(0)
const [otherCounter,setOtherCounter]=useState(0) 
//useCallback(callback,dependencies)
const increment= useCallback(()=> {
  setCount(count+1)
},[count])

const incrementOtherCounter= useCallback(()=> {
setOtherCounter(otherCounter+1)
},[otherCounter])

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Aug 09 2022

Shirshak Kandel

0 Answers Avg Quality 2/10

react usecallback

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const memoizedCallback = useCallback(
  () => {
    doSomething(a, b);
  },
  [a, b],
);

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: reactjs.org

Tags: javascript j

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Contributed on Aug 26 2021

Vast Vole

0 Answers Avg Quality 2/10

usecallback react

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import React, { memo, useCallback, useState } from 'react'

const Logger = memo((props) => {
  props.log()
  return null
})

export default function App() {
  const [count, setCount] = useState(0)
  const count5 = Math.floor(count / 5)

  const memoizedFunction = useCallback(() => {
    console.log('useCallback')
  }, [count5])

  const normalFunction = () => {
    console.log('normal')
  }

  return (
    <>
      <button
        onClick={() => {
          setCount(count + 1)
        }}
      >
        Increment {count}
      </button>
      <Logger log={memoizedFunction} />
      <Logger log={normalFunction} />
    </>
  )
}

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: www.react.express

Tags: hook

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Contributed on Nov 08 2022

Mehedi Islam Ripon

0 Answers Avg Quality 2/10

usecallback hook

Comment

//useCallback to remove too much re-render  
const checkFromLocalStorage = useCallback(() => {
    if (localStorage.getItem('connectedWallet')) {
      //check connectWallet with switch
      switch (localStorage.getItem('connectedWallet')) {
        case 'walletConnect':
          activate(WalletConnect);
        case 'metamask':
          activate(Injected);
        default:
      }
    }
  }, [active]);

  useEffect(() => {
    checkFromLocalStorage();
  }, [active]);

Popularity 10/10 Helpfulness 2/10 Language typescript

Source: Grepper

Tags: hook

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Contributed on Aug 20 2022

Shirshak Kandel

0 Answers Avg Quality 2/10

react import useCallBack

Comment

import { useCallback } from 'react'

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: flaviocopes.com

Tags: import im

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Contributed on Dec 08 2021

ExceptionThrower

0 Answers Avg Quality 2/10

usecallback in react

Comment

useCallback is a react hook which is used for the memorisation of the callback
function as we know in react every component re-rendered so its function also re 
created and so avoid the recreation of complex functions we used the concept of
useCallback which takes a function as a arguement and a dependency list for 
which condition the component are going to create itself;

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Mar 21 2022

Coding is fun

0 Answers Avg Quality 2/10

useCallback() react

Comment

import React, { useState, useCallback } from 'react'
var funccount = new Set();
const App = () => {
 
 
  const [count, setCount] = useState(0)
  const [number, setNumber] = useState(0)
 
const incrementCounter = useCallback(() => {
  setCount(count + 1)
}, [count])
const decrementCounter = useCallback(() => {
  setCount(count - 1)
}, [count])
const incrementNumber = useCallback(() => {
  setNumber(number + 1)
}, [number])
   
funccount.add(incrementCounter);
funccount.add(decrementCounter);
funccount.add(incrementNumber);
alert(funccount.size);
 
  return (
    <div>
      Count: {count}
      <button onClick={incrementCounter}>
         Increase counter
      </button>
      <button onClick={decrementCounter}>
         Decrease Counter
      </button>
      <button onClick={incrementNumber}>
         increase number
      </button>
    </div>
  )
}
 
 
export default App;

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: www.geeksforgeeks.org

Tags: javascript j

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Contributed on Jan 05 2023

Sourabh kumar

0 Answers Avg Quality 2/10

React useCallback Hook

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React useCallback Hook

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