Following a tutorial on youtube, building a rock-paper-scissors game, but they dont really explain in detail every step. So im asking you lads, why do I have to put parameters in the win function? I did not put any parameters in the lose/tie function and it's still working.

function win(user, computer) {
  userScore++;
  userScore_span.innerHTML = userScore;
  computerScore_span.innerHTML = computerScore;
  result_div.innerHTML = "You won!"
}
function lose() {
  computerScore++;
  userScore_span.innerHTML = userScore;
  computerScore_span.innerHTML = computerScore;
  result_div.innerHTML = "Computer wins!"
}
function tie() {
  result_div.innerHTML = "Game tie!"
}

function rockPaperScissors(userChoice) {
  const computerChoice = getComputerChoice()

  if (userChoice === 'paper' && computerChoice === 'rock' || 
  userChoice === 'rock' && computerChoice === 'scissors' || 
  userChoice === 'scissors' && computerChoice === 'paper') {
    win(userChoice, computerChoice)
  } else if (userChoice === computerChoice) {
    tie(userChoice, computerChoice) 
  } else {
    lose(userChoice, computerChoice)
  } 
}

bonus: does anybody know somebody who teaches people javascript but explains everything crystal clear? im struggling to make myself understand the choices I have to do when building something. thanks!!