useMemo in React Js

 App.js:

import React, {useState, useMemo} from "react";

import './App.css'

function App()

{

  const [count, setCount]=useState(0)

  const [item, setItem]=useState(10)

  const multicountMemo=useMemo(

    function multiCount()

    {

      console.warn("multicount")

      return count*5

    }, [count]

  )

  return(

    <div className="App">

      <h1>Use Memo Tutorial</h1>

      <h3>Count : {count}</h3>

      <h3>Item : {item}</h3>

      <h3>Multicountmemo: {multicountMemo}</h3>

      <button onClick={()=> setCount(count+1)}>Update Count</button>

      <button onClick={()=>setItem(item*10)}>Update Item</button>

    </div>

  )

}

export default App;