edit: now returning undefined

function computerPlay(){
const arr = ["Rock","Paper","Scissors"];
const random = Math.floor(Math.random()* arr.length);
return arr[random];

}

function playerPlay(){
let option = prompt("choose an action");
return option;
}

function playRound(ps,cs){
if (ps === cs){
return ('you draw!');
}else if ((ps === 'rock') && (cs === 'scissors')){
return("you win! rock beats scissors");
} else if (ps === 'rock' && cs === 'paper'){
return("you lose! paper  beats rock");
}else if(ps === 'paper' && cs === 'rock'){
return("you win! Paper beats scissors");
}else if(ps === 'paper' && cs === 'scissors'){
return("you lose! scissors beats paper");
}else if(ps === 'scissors' && cs === 'paper'){
return("you win! scissors beats paper");
}else if(ps === 'scissors' && cs === 'rock'){
return("you lose! rock beats scissors");
}

}

const ps=playerPlay();
const cs = computerPlay();
console.log(playRound(ps,cs));