var RockPaperScissors = (function () {
    var t = 'Tie',
        c = 'Computer wins',
        p = 'Player wins',
        winningMap = [
            [t, c, p],
            [p, t, c],
            [c, p, t]
        ],
        choices = ["Rock", "Paper", "Scissors"];

    var getComputerChoice = function () {
        return Math.floor(Math.random() * 3);
    };

    var getWinner = function (playerChoice, computerChoice) {
        return winningMap[playerChoice][computerChoice];
    };

    function RockPaperScissors(playerChoice) {
        this.playerChoice = playerChoice;
        this.computerChoice = getComputerChoice();
        this.winner = getWinner(this.playerChoice, this.computerChoice);
    }

    RockPaperScissors.prototype.toString = function () {
        return this.winner + " [Computer: " + choices[this.computerChoice] + ", Player: " + choices[this.playerChoice] + "]";
    };

    return RockPaperScissors;

})();

$('#choice').on('change', function () {
    var $input = $(this);

    if ($input.val() === '-1') return;

    var rockPaperScissors = new RockPaperScissors($input.val());

    $('#message').html(rockPaperScissors.toString());
});

var winningMap = {Rock: "Scissors", Paper: "Rock", Scissors: "Paper"};

var getWinner = function (playerChoice, computerChoice) {
    if(playerChoice === computerChoice){
        return "Tie";
    }
    if(computerChoice === winningMap[playerChoice]){
        return "Player Wins";
    }
    return "Computer Wins";
};

var stringMapping = ["Rock", "Scissors", "Paper"];

var getComputerChoice = function () {
    return stringMapping[ Math.floor(Math.random() * 3) ];
};

function RockPaperScissors (){
     var getComputerChoice = function(){ ... };    //= private variable
     this.getWinner = function(){ ... };           //= public variable
};

var actualObject = new RockPaperScissors();
actualObject.method();
actualObject['method']();

if ($input.val() === '-1') { return; }