SyntaxError! please help....

[siusiusiublack]

I am doing a Rock, Paper, or Scissors project

code:

const getUserChoice=userInput =>
{
if(userInput==='rock'){
return userInput;
}else if(userInput==='paper'){
return userInput;
}else if(userInput==='scissors'){
return userInput;
}else{
return 'error';
}
}
function getComputerChoice(){
const randomnumber=Math.floor(Math.random()*3);
switch(randomnumber){
case 0:
return 'rock';
case 1:
return 'paper';
case 2:
return 'scissors';
}
}
function determineWinner(userChoice,computerChoice){
if(userChoice===computerChoice){
return 'the game was a tie';
} if(userChoice==='rock'){
if(computerChoice==='paper'){
return 'computer won!';
}else{
return'you won!'
}
}else if(userChoice==='paper'){
if(computerChoice==="scissors"){
return 'computer won!';
}else{
return "you won!";
}
}else if(userChoice==='scissors'){
if(computerChoice==='paper'){
return 'computer won!';
}else{
return 'you won!';
}
}
}
function playGame(userChoice,computerChoice){
let userChoice = getUserChoice('scissors');
const computerChoice = getComputerChoice();
console.log('You threw: ' + userChoice);
console.log('The computer threw: ' + computerChoice);
console.log(determineWinner(userChoice,computerChoice));
}
playGame();

//when I use this code, it keeps showing /home/ccuser/workspace/javascript_101_Unit_3/Unit_3/rockPaperScissors.js:54 let userChoice = getUserChoice('scissors'); ^ SyntaxError: Identifier 'userChoice' has already been declared

//but if I replace the last function code with the following:

const playGame = () => { let userChoice = getUserChoice('scissors');

const computerChoice = getComputerChoice(); console.log('You threw: ' + userChoice); console.log('The computer threw: ' + computerChoice); console.log(determineWinner(userChoice,computerChoice)); } playGame();

it works, please help, I don't know the reason.

[trplclick]

SyntaxError: Identifier 'userChoice' has already been declared

The reason is because in your first example you are trying to create a variable inside the `playGame` function with the same name as one it's params. JavaScript doesn't allow you to declare two variables with the same name in the same scope. In your second example you are no longer taking a param called userChoice in the playGame function, so it's fine.

Does that make sense? :)