Rock, Paper, Scissors choice game, Code Academy course js exercise

rock-paper-scissors_game

var userChoice;
 
var getUserChoice = function(){
  var userChoice = prompt("Choose rock, paper, scissors!");
  if((userChoice != null) && !(userChoice==="rock" || userChoice==="paper" || userChoice==="scissors" )) {getUserChoice();}
  return userChoice;
}; 
 
userChoice = getUserChoice();
if(userChoice === null) console.log("Cancel play the game");
else {
  var computerChoice = Math.random(); userChoice
  if (computerChoice < 0.34) { computerChoice = "rock"; } 
  else if(computerChoice <= 0.67) { computerChoice = "paper"; } 
  else { computerChoice = "scissors"; } 
 
  console.log("Computer: " + computerChoice); 
  console.log("You: " + userChoice); 
  
  var compare = function(choice1,choice2){ 
    if(choice1 === choice2) return "tie"; 
    else if(choice1==="rock"){ 
      if(choice2==="scissors") return "rock"; 
      else return "paper"; 
    }else if(choice1==="paper"){ 
      if(choice2==="rock") return "paper"; 
      else return "scissors"; }
    else{ 
      if(choice2==="rock") return "rock"; 
      else return "scissors"; } 
  } 
  
  var result = compare(userChoice,computerChoice);
  if(result=="tie")  message = "The result is tie!"
  else{
    if(result==userChoice) winner = "You";
    else winner = "Computer"
    message = "The winner is " + winner;
  }
  
  console.log(message);
}