lizard spock version (second is faster due to not calling array methods)

0spock.js

function compare(me, comp) {

  var plays = ["scissors", "paper", "rock", "lizard", "spock"];

  var mine = plays.indexOf(me);
  var computer = plays.indexOf(comp);

  if (mine === computer)
    return "You Tie";

  var result = ((mine + 1) % 5) === computer || ((mine + 3) % 5) === computer;

  if (result)
    return "You Win";
  else
    return "You Lose";

}


console.log(compare('spock', 'scissors'), 'win');
console.log(compare('scissors', 'paper'), 'win');
console.log(compare('paper', 'scissors'), 'lose');
console.log(compare('rock', 'scissors'), 'win');
console.log(compare('paper', 'spock'), 'win');
console.log(compare('lizard', 'spock'), 'win');
console.log(compare('rock', 'lizard'), 'win');
console.log(compare('rock', 'lizard'), 'win');
console.log(compare('spock', 'paper'), 'lose');
console.log(compare('scissors', 'spock'), 'lose');
console.log(compare('spock', 'paper'), 'lose');
console.log(compare('spock', 'rock'), 'win');

1spock.js

function compare(me, comp) {

  var S = "scissors";
  var P = "paper";
  var R = "rock";
  var L = "lizard";
  var K = "spock";

  var mine = me === S ? 0 : me === P ? 1 : me === R ? 2 : me === L ? 3 : me === K ? 4 : null;
  var computer = comp === S ? 0 : comp === P ? 1 : comp === R ? 2 : comp === L ? 3 : comp === K ? 4 : null;

  if (mine === computer)
    return "You Tie";

  var result = ((mine + 1) % 5) === computer || ((mine + 3) % 5) === computer;

  if (result)
    return "You Win";
  else
    return "You Lose";

}

console.log(compare('spock', 'scissors'), 'win');
console.log(compare('scissors', 'paper'), 'win');
console.log(compare('paper', 'scissors'), 'lose');
console.log(compare('rock', 'scissors'), 'win');
console.log(compare('paper', 'spock'), 'win');
console.log(compare('lizard', 'spock'), 'win');
console.log(compare('rock', 'lizard'), 'win');
console.log(compare('rock', 'lizard'), 'win');
console.log(compare('spock', 'paper'), 'lose');
console.log(compare('scissors', 'spock'), 'lose');
console.log(compare('spock', 'paper'), 'lose');
console.log(compare('spock', 'rock'), 'win');