Reimplement ruby map

gaga_map.rb

class Array
  def gaga_map(&blk)
    puts "---method #{__method__} start---"
    output = []
    
    if block_given?
      self.each do |item|
        output << blk.call(item)
      end
      output = output.to_enum :gaga_map
    else
      output = self.to_enum :gaga_map
    end
    
    output
  end
end

arr = ["a", "b", "c"]
ar1 = [1,2,3,4]

puts "==map=="
p arr.map(&:upcase)
p arr.map

puts "==gaga_map=="
p arr.gaga_map(&:upcase)
p = arr.gaga_map