WAT

pemis.rb

#!/usr/bin/env ruby

class C
  def initialize
    @x = 0
  end

  def f xs
    if @x < 10
      xs << @x
      @x += 1
      f xs
    else
      xs
    end
  end

  def g xs
    if @x < 10
      xs << lambda { @x }
      @x += 1
      g xs
    else
      xs
    end
  end

  def h xs
    x = nil
    10.times do |y|
      x = y
      xs << lambda { x + 1 }
    end
    xs
  end
end

puts C.new.f([])
puts C.new.g([]).map(&:call)
puts C.new.h([]).map(&:call)