rock-paper-scissors.js

function rockPaperScissors(string) {
  var options = {
    1: "Rock",
    2: "Paper",
    3: "Scissors",
  };

  var judge = {
    "Function wins!": [["Rock", "Paper"], ["Paper", "Scissors"], ["Scissors", "Rock"]],
    "You win!": [["Paper", "Rock"], ["Scissors", "Papers"], ["Rock", "Scissors"]],
    "Aww, a draw...": [["Paper", "Paper"], ["Rock", "Rock"], ["Scissors", "Scissors"]]
  };

  var functionMove = options[Math.floor((Math.random() * 3) + 1)];
  var moves = [string, functionMove].join(" ")
  var message = "";

  for (var elem in judge) {
    var group = judge[elem];
    for (var i=0; i < group.length; i++) {
        var potential = group[i].join(" ")
        if (moves === potential) {
          message = elem;
          break;
        }
    }
  }
  console.log("You played " + string + ", function played " + functionMove + ": " + message)
}