React - Hooks: useState, useEffect - Practice 참참참 game

import React, { useEffect, useState } from 'react'

const Ex15 = () => {
let pos = [ '왼쪽', '정면','오른쪽']

const [myChoice,setMyChoice] = useState('왼쪽')
const [comChoice,setComChoice] = useState('왼쪽')
const [result,setResult]= useState('무승부')
const [randomItem, setRandomItem] = useState(null);
const [round,setRound]=useState(0);
const getRandomItem = () => {
    const randomIndex = Math.floor(Math.random() * 3);
   
    return randomIndex
};
const btnCk = (e) =>{
    setRound(round+1);
    console.log("button click", e.target.innerText);
    setMyChoice(e.target.innerText);
    setComChoice(pos[getRandomItem()])
    
}
 
useEffect(()=>{
    console.log('round겂 변경');
    if(round>0){
        comChoice === myChoice 
        ? setResult('승리')
        : setResult('실패')
    }

},[round])

  return (
    <div>
<h1>참참참 게임</h1>
<p>나의 공격: {myChoice}</p>
<p>상대방 수비: {comChoice}</p>
<p>결과: {result}</p>
<hr></hr>
{pos.map(item =><button onClick={btnCk} key = {item}>{item}</button>)}

    </div>
  )
}

export default Ex15