Reactクラス構成部品

import React from "react";

export default class App extends React.Component {
	constructor(props){
    	super(props)
      	this.state ={
        	name:"pandaman",
          	age : 27,
          	job:"PM"
          
        }
      
      render
    }
  
  redner(){
  	const {name,age,job} = this.state;
    
    return (
    	<div>
      	<div>name:{name}</div>
		<div>age:{age}</div>
		<div>job:{job}</div>
      </div>
    )
  }
}

onAgeHandler = () => {
	this.steState((state) => {age:state.age +1})
}

onAgeHandler = () => {
  const {age} = this.state;
	this.steState({age:age +1})
}


//age가 업데이트되면 callback 작동하여 업데이트된 age가 로그에 남기게 됨
onAgeHandler = () => {
  
	this.steState(prevState => ({
    	age:prevSTate.age + 1
    }),
    () => console.log(this.state.age)
   );
}