slack-slot

bot.rb

require 'slack-ruby-bot'
class SlotBot < SlackRubyBot::Bot
  match /slot/ do |client, data, match|
    array = %w(:ulicknormanowen: :shausagi: :fire: :sushi:)
    result = []
    3.times do
      result << array.sample
    end
    msg = "Start! =>"
    msg << result.join(" ")
    if result.group_by{|w|w}.count == 1
      msg << "　おめでとう！ :grinning:"
    else
      msg << "　残念！ :sweat:"
    end
    client.say(
      channel: data.channel,
      text: msg
    )
  end
end
SlotBot.run

  match /slot/ do |client, data, _|
    array = %w(:ulicknormanowen: :shausagi: :fire: :sushi:)
    result = 3.times.each_with_object([]) {|_, ary|
      ary << array.sample
    }

    msg = "Start! => #{result.join(' ')}"
    msg << (result.group_by{|_|_}.count == 1 ? "おめでとう！ :grining:" : "残念！ :sweat:")

こんなんでどう？