Rock, paper, scissors game with switch declaration

rock_paper_scissors_switch.js

function validateGame(user, cpu){
  switch(true){
    case (user === cpu):
      alert("Tie!");
      break;
    case (user === 2 && cpu === 3):
      alert("CPU wins, sorry!");
      break;
    case (user === 1 && cpu === 2):
      alert("CPU wins, sorry!");
      break;
    case (user === 3 && cpu === 1):
      alert("CPU wins, sorry!");
      break;
    case (user < 1 || user > 3):
      alert("Your choice must be between 1 and 3!");
      break;
    default:
      alert("You win!");
  }
}

let userInput = prompt("Please choose a number between 1 and 3: 1 for rock, 2 for paper, 3 for scissors");
let user = Number(userInput);
let cpu = Math.floor((Math.random() * 3) + 1);
validateGame(user, cpu);