class HaveWant
 
  attr_reader :answers
 
  def initialize(have, *args, want)
    @have = have
    @args = args
    @want = want
 
    find_matches
  end
 
  private
 
  def find_matches
 
    @answers = @have.methods.map do |method|
      @have.dup.method(method)
    end.select do |method|
      begin
        method.call(*@args).eql? @want
      rescue
        false
      end
    end.map(&:name)
 
  end
end
 
havewant = HaveWant.new("hello", "HELLO")
 
puts havewant.answers
 
havewant = HaveWant.new([3,3,3,4,5], 2..3, [3,4])
 
puts havewant.answers

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