리액트 UseState

갑자기 튀어나온 prevNumber

갑자기 튀어나온 prevNumber 때문에 당황했는데
덧글로 알려주셨당!

UseState 소스코드

• https://github.com/facebook/react/blob/fd557d453d37eab29eca18f0507750ab2093669d/packages/react-reconciler/src/ReactFiberHooks.js
• https://blog.logrocket.com/a-guide-to-usestate-in-react-ecb9952e406c/
  
  

Reference

• https://react.vlpt.us/basic/07-useState.html