rockpaperscissors.js

var userChoice = prompt("Do you choose rock, paper or scissors?");
var computerChoice = Math.random();
if (computerChoice < 0.34) {
	computerChoice = "rock";
} else if(computerChoice <= 0.67) {
	computerChoice = "paper";
} else {
	computerChoice = "scissors";
}

var compare = function(choice1, choice2) {
    if (choice1 == choice2) {
    return "The result is a tie!";
    }
    if (choice1 == "rock") {
        if (choice2 == "scissors") {
            return "rock wins";
        } else {
            return "paper wins";
        }
    }
    if (choice1 == "paper") {
        if (choice2 == "rock") {
            return "paper wins";
        } else {
            return "scissors wins";
        }
    }
    if (choice1 == "scissors") {
        if (choice2 == "rock") {
            return "rock wins";
        } else {
            return "scissors wins";
        }
    }
};
console.log("You chose " + userChoice);
console.log("The computer chose " + computerChoice);
compare(userChoice, computerChoice);