So I thought this would be pretty basic but I'm having no luck in finding out whether an object with the same attributes as one within an array is in fact in the array. The below code returns false:
hand = [Card.new(:ace)]
puts("#{hand.include?(Card.new(:ace))}")
yet I can't see how I can check if the card in the hand array has the same contents of the card I provide in the include? argument.
So the proper way to ensure object equality is to implement #== and #hash
class Card
attr_accessor :card
def initialize(card)
@card = card
end
def ==(other)
other.class == self.class && other.card == @card
end
alias_method :eql?, :==
def hash
@card.to_s.hash
end
end
p Card.new(:ace) == Card.new(:ace)
#=> true
assuming
class Card
attr_reader :card
def initialize(card)
@card = card
end
end
you can use:
hand.find { |c| c.card == :ace }
find returns either first matching element or nil
You would need to add a method to measure equality between cards of the card class. Your class may look like this:
class Card
attr_reader :value
def initialize(v)
@value = v
end
def ==(other_card)
@value == other_card.value
end
end
