A dice betting game using Opal Ruby to Javascript source-to-source compiler with JS interaction

dice_betting_game_js_int.rb

# Dice Betting Game, https://opalrb.com/try/
require "native"

bank = 100;

while bank > 0 do
  bet = $$.prompt("Place your bet").to_i
  dice1 = (rand * 6).ceil
  dice2 = (rand * 6).ceil
  outcome = dice1 == dice2
  bank += bet if outcome
  bank -= bet unless outcome
  puts "Numbers are: #{dice1} #{dice2}"
  puts outcome_txt = outcome ? "You Win" : "You Lose"
  outcome_txt += ", bank is now #{bank}"

  puts "Bank is now #{bank}"
  $$.alert(outcome_txt)
end