rps.jsh

import static java.lang.System.*;
import java.util.*;

out.println("Let's play Rock Paper Scissors!");

var r = "rock";
var p = "paper";
var s = "scissors";
var all_choices = List.of(r, p, s);

var user = console().readLine("Enter a choice (%s, %s, %s): ", r, p, s);

if (!all_choices.contains(user)) {
    out.println("Invalid choice! ");
    exit(1);
}

var computer = all_choices.get((int) (Math.random()*3));
out.printf("You chose %s, computer chose %s.%n", user, computer);

// r>s, p>r, s>p
if (user.equals(computer)) {
    out.println("Tie!");
} else if (user.equals(r) && computer.equals(s) ||
            user.equals(p) && computer.equals(r) ||
            user.equals(s) && computer.equals(p)) {
    out.println("You win!");
} else {
    out.println("You lose!");
}