App.js import React, { useState } from 'react'; let init = 0; const App = () => { console.log('리빌드 됨'); const [num, setNum] = useState(1); const increase = () => { setNum(num + 2); }; const decrease = () => { setNum(num - 2); }; const increase2 = () => { console.log('increase2'); setNum(num + Number(init)); }; const decrease2 = () => { setNum(num - Number(init)); }; const numHandle = (e) => { co..
