--description--

Your game will be played against the computer. You will write a function that randomly returns "rock", "paper" or "scissors".

You do not need to worry about the front-end part of the game. You will only write the logic for the game. Open the script.js and start following the instructions.

User stories:

1. You should have a function named getComputerChoice.

2. Your getComputerChoice function should return "rock", "paper", or "scissors" at random.

Hint: The Math.random method returns a random number that’s greater than or equal to 0 and less than 1. Think about how you can use this to conditionally return one of the multiple choices.

Your game will be played by a human player. You will write a function that takes the user's choice and returns it.

1. Create a function named getHumanChoice.

2. Write the code so that getHumanChoice will return one of the valid choices depending on what the user inputs.

Hint: Use the prompt method to get the user’s input.

Your game will keep track of the player's score. You will write variables to keep track of the player's score.

1. Create two new variables named humanScore and computerScore in the global scope.

2. Initialize those variables with the value of 0.

Your game will be played round by round. You will write a function that takes the human and computer player choices as arguments, plays a single round, increments the round winner’s score and logs a winner announcement.

1. Create a new function named playRound.

2. Define two parameters for playRound. Parameter one humanChoice and parameter two computerChoice. Use these two parameters to take the human and computer choices as arguments.

3. Make your function’s humanChoice parameter case-insensitive so that players can input "rock", "ROCK", "RocK", or other variations.

4. Write the code for your playRound function that returns a string value representing the round winner.

• If it is a tie, it should return "It's a tie!".

• If the player wins, it should return "You win! [player choice] beats [computer choice]".

• If the computer wins, it should return "You lose! [computer choice] beats [player choice]".

1. Increment the humanScore or computerScore variable based on the round winner.

Your game will play 3 rounds. You will write a function named playGame that calls playRound to play 3 rounds, keeps track of the scores, and declares a winner at the end.

1. Create a new function named playGame.

2. Create a loop that plays 3 rounds and calls the playRound function each time with the human's choice and the computer's choice functions as arguments.

3. At the end of the game, return the winner of the game based on who won the most rounds.

• If the human player wins more rounds than the computer player, return a message that says "You win the game!".

• If the computer player wins more rounds than the human player, return a message that says "You lose the game!".

--hints--

You should have a function called getComputerChoice

assert.isFunction(getComputerChoice);

Your getComputerChoice function should return "rock", "paper", or "scissors" at random.

const counts = {}
for (let i = 0; i < 100; i++) {
  const result = getComputerChoice();
  counts[result] = (counts[result] ?? 0) + 1;
}
assert.lengthOf(Object.keys(counts), 3);
assert.include(Object.keys(counts), "rock");
assert.include(Object.keys(counts), "paper"); 
assert.include(Object.keys(counts), "scissors");

You should have a function called getHumanChoice

assert.isFunction(getHumanChoice);

You should have two variables named humanScore and computerScore in the global scope.

assert.exists(humanScore);
assert.exists(computerScore);

You should have a function called playRound

assert.isFunction(playRound);

Your playRound function should take the human and computer player choices as arguments with the parameters humanChoice and computerChoice.

assert.match(playRound.toString(), /\s*(?:\bhumanChoice\b\s*,\s*\bcomputerChoice\b)/);

Your playRound function should be case-insensitive so that players can input "rock", "ROCK", "RocK", or other variations.

assert.match(playRound.toString(), /\bhumanChoice\s*\.toLowerCase\(\)/);

Your playRound function should return the string "It's a tie!" if the human and computer choices are the same.

assert.equal(playRound("rock", "rock"), "It's a tie!");

Your playRound function should return the string "You win! [player choice] beats [computer choice]" if the player wins.

assert.equal(playRound("rock", "scissors"), "You win! rock beats scissors");

Your playRound function should return the string "You lose! [computer choice] beats [player choice]" if the computer wins.

assert.equal(playRound("rock", "paper"), "You lose! paper beats rock");

Your playRound function should increment the humanScore or computerScore variable based on the round winner.

humanScore = 0;
computerScore = 0;
playRound("rock", "scissors");
assert.equal(humanScore, 1);

You should have a function called playGame.

assert.isFunction(playGame);

You should use a loop to play 3 rounds.

assert.match(playGame.toString(), /\bfor\s*\(/);

You should return the winner of the game based on who won the most rounds.

window.prompt = () => "rock";
assert.match(playGame(), /You (win|lose) the game!/);

--seed--

--seed-contents--

const hand = ['rock', 'paper', 'scissors'];

<html lang="en">
<head>
  <script src="script.js"></script>
</head>
</html>

--solutions--

<html lang="en">
<head>
  <script src="script.js"></script>
</head>
</html>

const hand = ['rock', 'paper', 'scissors'];


let computerScore = 0;
let humanScore = 0;

const getComputerChoice = () => {
  return hand[Math.floor(Math.random() * hand.length)];
}

const getHumanChoice = () => {
  return prompt();
}

const playRound = (humanChoice, computerChoice) => {
  humanChoice = humanChoice.toLowerCase()

  const tie = "It's a tie!"
  const win = `You win! ${humanChoice} beats ${computerChoice}`
  const lose = `You lose! ${computerChoice} beats ${humanChoice}`


  if (humanChoice == 'rock') {
    if (computerChoice == 'rock') {
      computerScore++;
      humanScore++;
      return tie;
    } else if (computerChoice == 'paper') {
      computerScore++;
      return lose;
    } else {
      humanScore++;
      return win;
    }
  } else if (humanChoice == 'paper') {
    if (computerChoice == 'rock') {
      humanScore++;
      return win;
    } else if (computerChoice == 'paper') {
      computerScore++;
      humanScore++;
      return tie;
    } else {
      computerScore++;
      return lose;
    }
  } else if (humanChoice == 'scissors') {
    if (computerChoice == 'rock') {
      computerScore++;
      return lose;
    } else if (computerChoice == 'paper') {
      humanScore++;
      return win;
    } else {
      computerScore++;
      humanScore++;
      return tie;
    }
  }
}

const playGame = () => {
  for(let i = 0; i < 3; i++){
    playRound(getHumanChoice(), getComputerChoice())
  }

  return humanScore > computerScore ? "You win the game!" : "You lose the game!"
}