Demonstration of how to create an #each method on our own class that behaves similarly to Array#each

pumpkin_collection.rb

class PumpkinCollection
  def initialize(colors)
    @colors = colors
  end

  def each
    i = 0

    while i < @colors.length do
      color = @colors[i]

      if block_given?
        yield color, 'big'
      end

      i += 1
    end
  end
end

pumpkins = PumpkinCollection.new(%w(brown orange yellow red))

pumpkins.each do |color, size|
  puts "Hello #{size} #{color}!"
end