rock-paper-scissors-game.js

gistfile1.js

// It asks a user to pick an option and returns the correct value
// ("Piedra", "Papel" or "Tijera") or an "Error"
function getOptionPicked(playerName) {
  const option = prompt(
    `Seleccione opción para el ${playerName}:\n1: Piedra\n2: Papel\n3: Tijera`
  );

  let pickedOption = null;
  switch (option) {
    case "1":
      pickedOption = "Piedra";
      break;
    case "2":
      pickedOption = "Papel";
      break;
    case "3":
      pickedOption = "Tijera";
      break;
    default:
      pickedOption = "ERROR";
  }

  return pickedOption;
}

// It receives the values picked by the players and returns the result
function getResult(optionPlayer1, optionPlayer2) {
  let result = "";
  if (optionPlayer1 === "ERROR" || optionPlayer2 === "ERROR") {
    result =
      "No se puede calcular el resultado porque ingresaron alguna opción incorrecta";
  } else if (optionPlayer1 === optionPlayer2) {
    result = "Empataron";
  } else if (
    (optionPlayer1 === "Piedra" && optionPlayer2 === "Tijera") ||
    (optionPlayer1 === "Papel" && optionPlayer2 === "Piedra") ||
    (optionPlayer1 === "Tijera" && optionPlayer2 === "Papel")
  ) {
    result = `Ganó el Jugador 1: ${optionPlayer1} le gana a ${optionPlayer2}`;
  } else {
    result = `Ganó el Jugador 2: ${optionPlayer2} le gana a ${optionPlayer1}`;
  }

  return result;
}

// It manages all the steps in the game
function main() {
  let isGameAvailable = true;

  do {
    const optionPlayer1 = getOptionPicked("Jugador 1");
    const optionPlayer2 = getOptionPicked("Jugador 2");

    const result = getResult(optionPlayer1, optionPlayer2);
    alert(result);

    // It asks if the users wants to play again
    isGameAvailable = confirm("¿Querés volver a jugar?");
  } while (isGameAvailable);
}

main();