Scalable solution for Rock-Paper-Scissor

Question

Just went through a variant of the game : Rock-Paper-Scissor-Lizard-Spock

I have written a Java code for traditional R-P-S problem, but when I tried extending my code

Answer 1

The shortest way:

var n = 5; // Rock, Paper, Scissors, Lizard-Spock

function calculate(x, y, n) {
  return 1 - ((n + x - y) % n) % 2;
}

function getWinner(p1Gestrure, p2Guesture) {
  if(p1Gestrure === p2Guesture) {
     return - 1; // tie
  }

  return this.calculate(p1Gestrure, p2Guesture); // 0: win for p1. 1: win for p2.
}

I've created a cli game, please feel free to take a look there. https://github.com/julianusti/rpc-es6