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How does Ruby's #count method deal with nil values?


You can write def my_count(*args) and check then length of args. I'd write:

module Enumerable
  def my_count(*args)
    case
    when args.size > 1
      raise ArgumentError
    when args.size == 1
      value = args.first
      reduce(0) { |acc, x| value == x ? acc + 1 :
acc }
    when block_given?
      reduce(0) { |acc, x| yield(x) ? acc + 1 :
acc }
    else
      reduce(0) { |acc, x| acc + 1 }
    end
  end
end

Categories : Ruby

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