Simple CLI rock, paper, scissors game.

rock_paper_scissors.js

const userInput = 'Bomb'.toLowerCase();

function getComputerChoice() {
  let randomInt = Math.floor(Math.random() * 3);
  switch (randomInt) {
    case 0:
      return 'rock';
      break;
    case 1:
      return 'paper';
      break;
    case 2:
      return 'scissors';
      break;
  }
}

function getUserChoice(userInput) {
  if (
    userInput === 'rock' ||
    userInput === 'paper' ||
    userInput === 'scissors' ||
    userInput === 'bomb'
  ) {
    return userInput;
  } else {
    console.log('Please enter either rock, paper, or scissors');
  }
}

function determineWinner(userChoice, computerChoice) {
  if (userChoice === computerChoice) {
    return 'The game was a tie.';
  } else if (userChoice === 'bomb') {
    return `The user wins! The ${userChoice} kills all!`;
  } else {
    if (userChoice === 'rock') {
      if (computerChoice === 'paper') {
        return `${computerChoice} covers ${userChoice}, computer wins!`;
      } else {
        return `${userChoice} smashes ${computerChoice}, user wins!`;
      }
    } else if (userChoice === 'paper') {
      if (computerChoice === 'scissors') {
        return `${computerChoice} cuts ${userChoice}, computer wins!`;
      } else {
        return `${userChoice} covers ${computerChoice}, user wins!`;
      }
    } else if (userChoice === 'scissors') {
      if (computerChoice === 'rock') {
        return `${computerChoice} smashes ${userChoice}, computer wins!`;
      } else {
        return `${userChoice} cuts ${computerChoice}, user wins!`;
      }
    }
  }
}

function playGame() {
  console.log(determineWinner(getUserChoice(userInput), getComputerChoice()));
}

playGame();