From: Michelle Pace <michelle@...>
Date: 2009-11-17T15:15:58+09:00
Subject: Meaning of '!(...'    EG: "myObject.parse!(argv)"   ..?

Hi there,

QUESTION:
Whilst "parse(argv)" is obvious, what does "opts.parse!(argv)" do in the
below code? And what is the word use to describe doing this?

CONTEXT:
I am looking at a class called 'Options' whose job is to parse command
line options which get passed to a program called 'PartInspector'. An
extract of this class follows:
------------------------------------------------------------
class Options

  def initialize(argv)
    @directory = DEFAULT_DIR
    parse(argv)
  end

  private
    def parse(argv)
      OptionParser.new do |opts|
      opts.banner = "Usage:  PartInspector [part_number]"

      opts.on("-h", "Shows this message") do
        puts opts
        exit
      end

      begin
        argv = ["-h"] if argv.empty?
        opts.parse!(argv)                          ## <------- HERE?!!?!
        rescue OptionParser::ParseError => e
          STDERR.puts e.message, "\n", opts
      end
    end#def parse()
   end#private class

end#option class
------------------------------------------------------------


I know its probably some basic syntax for ruby, not knowing what it is
called however makes it difficult to look it up.

Thank-you in advance, Michelle
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