Refactoring Pokemon type weekness

Question

I made pokemon weekness finder by ruby. It takes a lot of words. Could you suggest bit nice and sophisticated to write this code?

The menu is as follows.

Answer 1

I think you can start from the structuring of game data:

game_data = {
  1 => ["Normal", "Fighting" ],
  2 => ["Fire", "Ground, Rock, Water"],
  3 => ["Water", "Fire, Ground, Rock"],
  4 => ["Electric", "Ground"],
  5 => ["Grass", "Bug, Fire, Flying, Ice, Poison"],
  6 => ["Ice", "Fighting, Fire, Rock, Steel"],
  7 => ["Fighting", "Fairy, Flying, Psychic"],
  8 => ["Poison", "Ground, Psychic"],
  9 => ["Ground", "Grass, Ice, Water"],
  10 => ["Flying", "Electric, Ice, Rock"],
  11 => ["Psychic", "Bug, Dark, Ghost"],
  12 => ["Bug", "Fire, Flying, Rock"],
  13 => ["Rock", "Fighting, Grass, Ground, Steel, Water"],
  14 => ["Ghost", "Dark, Ghost"],
  15 => ["Dragon", "Dragon, Fairy, Ice" ],
  16 => ["Dark", "Bug, Fairy, Fighting"],
  17 => ["Steel", "Fighting, Fire, Ground"],
  18 => ["Fairy", "Poison, Steel" ]
}

Now you can work with it:

puts "Which type of Pokemon do you want to know weaknesses?\nMenu"
game_data.each { |point, data| puts "#{point} #{data.first}" }
type = gets.to_i
return "Error" unless game_data.has_key?(type)
puts game_data[type].last

Recommendation for future, if case statement becomes too big it's good point to think about to use Hash