How to dynamically create a NamedTuple for double splatting?

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6

I think what you’re looking for in your most recent example is Hash#fetch:

def generate_item_by_id(id, mods)
  quantity = 1
  cold_res = mods.fetch "cold_res", default: 0
  fire_res = mods.fetch "fire_res", default: 0
  lightning_res = mods.fetch "lightning_res", default: 0
        
  {id, quantity, cold_res, fire_res, lightning_res}
end

mods_to_roll = {"cold_res", "fire_res", "lightning_res"}   
mods = Hash(String, Int32).new

3.times do
  mods[mods_to_roll[rand(mods_to_roll.size)]] = 20
end

pp generate_item_by_id(5, mods)

https://play.crystal-lang.org/#/r/7zxx

I suspect that this could be more easily solved with a struct, though. How do you get your hash in the first place?

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