Ruby/Development/Generator

require "generator"
l = ["junk1", 1, "junk2", 2, "junk3", "junk4", 3, "junk5"]
g = Generator.new(l)
g.next                                # => "junk1"
g.next                                # => 1
g.next                                # => "junk2"

require "generator"
l = ["junk1", 1, "junk2", 2, "junk3", "junk4", 3, "junk5"]
g = Generator.new { |g| l.each { |e| g.yield e unless e =~ /^junk/ } }
g.next                                            # => 1
g.next                                            # => 2
g.next                                            # => 3