DZone Snippets: symbol code

file extension methods

elliottcable (elliott cable) — Sat, 17 May 2008 02:08:39 GMT

Allows you to use file extensions as methods



class File

  # Feel free to add more here, as you need them.

  Extensions = %r=^(txt|rb|markdown|textile|haml|sass|css|html|xhtml)$=i

  

  module Extension

    def method_missing(meth, *args)

      if Extensions =~ meth.to_s

        [self, '.', meth.to_s].join

      else

        super

      end # if

    end # method_missing

  end # Extension

end # File



class Symbol

  include File::Extension

end

class String

  include File::Extension

end



'myfile'.html

# => "myfile.html"



:a_file.rb

# => "a_file.rb"

High-performance Ruby: faster Symbol.to_s

ciconia (Sharon Rosner) — Tue, 15 Aug 2006 11:22:50 GMT

Here's something that I found useful for shaving a few microseconds off. The performance gain ranges between 10% and 35%! YMMV.

Note: updated with suggestion by trans.



class Symbol

  def to_s

    @str_rep || (@str_rep = id2name.freeze)

  end

end

gen-sym

gregg.irwin (Gregg Irwin) — Fri, 13 Jan 2006 04:19:51 GMT



REBOL [

    Title: "Unique symbol generator"

]



gen-sym-ctx: context [

    prefix: "&"

    counter: 0

    clear: does [counter: 0]

    set-prefix: func [value] [prefix: form value]

    set 'gen-sym does [

        counter: counter + 1

        to word! join prefix counter

    ]

]



repeat i 5 [print gen-sym]

gen-sym-ctx/set-prefix 'G

gen-sym-ctx/clear

repeat i 5 [print gen-sym]