How to make 2 entities of the same class interact?

user_18621502 0
Viewed 31

I am trying to get 2 "people" of the same class to interact with each other, and change each other's "stats." However, I get the error, "formal argument cannot be a constant."

class Hands 
  attr_reader :name, :element, :skill, :mana, :health, :attack, :fire, :water, :lyfe

  def initialize(name, element, skill)
    @mana = 100
    @health = 200
    @name = name
    @element = element
    @skill = skill
  end

  def mana 
   sleep 1
    puts "#{@name} has #{@mana} mana."
  end

  def health
    sleep 1
    puts "#{@name} has #{@health} HP."
  end

  def restore(Hands)
    if @element == "Lyfe"
      @mana = 100
      puts "#{@name} has been restored!"
    else 
      puts "#{@name} cannot use this ability!"
    end
  end
end

player1 = Hands.new('Silk', 'Lyfe', 'Summon')
player2 = Hands.new('Nubz', 'Lyfe', 'Manipulate Wildlife')
player3 = Hands.new('Lisk', 'Water', 'Invisible')
player4 = Hands.new('Azzi', 'Water', 'Manipulate Water')
player5 = Hands.new('Zeph', 'Fire', 'Lightning')
player6 = Hands.new('Ford', 'Fire', 'Manipulate Fire')
player7 = Hands.new('Boyd', 'Fire', 'Craft')

player1.restore("Nubz")

Here I am trying to get player1 to "restore" player2 back to full mana. I know the code isn't perfect, but I'm not sure how else to do this. Focussing on the restore command, the others work fine.

ruby
1 Answers

You should be able to pass the instance of the player you want affected to the restore method rather than the name string. You can then update that player's attributes as needed. A quick example:

Update class to make mana writeable:

class Hands 
  attr_reader :name, :element, :skill, :mana, :health, :attack, :fire, :water, :lyfe
  attr_writer :mana

  # ...
end

Update restore method to accept player instance:

def restore(hands)
  if element == "Lyfe"
    hands.mana = 100
    puts "#{hands.name} has been restored!"
  else 
    puts "#{name} cannot use this ability!"
  end
end

Pass instance to method:

player1 = Hands.new('Silk', 'Lyfe', 'Summon')
player2 = Hands.new('Nubz', 'Lyfe', 'Manipulate Wildlife')

player1.restore(player2)
#=> Nubz has been restored!
user_46132360
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