[React] Coding Convention

In React, it’s conventional to use onSomething names for props which represent events and handleSomething for the function definitions which handle those events.

• onSomething: events 나타내는 props
• handleSomething: events를 실제로 다루는 function

그래서

onSomething = {
    () => { handleSomething(args) }
}

형태로 많이 쓴다.

state의 값을 바꿀 때는 immutable하게 가자