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Learning Ruby - 8

Exploiting Libraries. Learning Ruby - 8. Ruby's Built-in Libraries. There's a large collection of standard libraries provided with Ruby The PickAxe provides a comprehensive survey of what's available

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Learning Ruby - 8

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  1. Exploiting Libraries Learning Ruby - 8

  2. Ruby's Built-in Libraries • There's a large collection of standard libraries provided with Ruby • The PickAxe provides a comprehensive survey of what's available • The Internet hosts a number of Ruby Library Repositories, with The Ruby Application Archive (RAA) and RubyForge the most popular • The move is on to use RubyGems as the standard library management tool • Don't reinvent the wheel (life is far too short) - use Ruby libraries whenever you can

  3. Example Library - Base64 require 'base64' # Conforms with RFC 2045. input = "Let us turn our thoughts today\n" + "To Martin Luther King\n" + "And recognize that there are ties between us" puts e_input = Base64.encode64( input ) puts Base64.decode64( e_input )

  4. Example Library - Date require 'date' dt = Date.new( 2006, 9, 21 ) puts dt.to_s puts "The month is " + dt.month.to_s puts "This is the " + dt.yday.to_s + "th day of the year" dt2 = DateTime.new( 2006, 9, 21 ) puts "It was a #{dt2.strftime( '%A' )} when you “ + “started learning Ruby."

  5. Example Library - Digests require 'digest/md5' require 'digest/sha1' input = "Let us turn our thoughts today\n" + "To Martin Luther King\n" + "And recognize that there are ties between us" puts "MD5: " + Digest::MD5.hexdigest( input ) puts "SHA1: " + Digest::SHA1.hexdigest( input )

  6. Example Library - Find require 'find' Find.find( "/home/barryp/ruby/bin" ) do |fh| print "\t#{fh}\n" end # of do.

  7. Example Library - Readline require 'readline' input = Readline::readline( "Gimme some: ", true ) puts input input = Readline::readline( "Gimme some more: ", true ) puts input

  8. Example Library - Readline (again) require 'readline' include Readline input = readline( "Gimme some: ", true ) puts input input = readline( "Gimme some more: ", true ) puts input

  9. Example Libraries - Windows require 'Win32API' # Do your worst ... require 'win32ole' browser = WIN32OLE.new( “Firefox.Application" ) browser.visible browser.navigate( "http://www.google.com" )

  10. Example Library - Zlib require 'zlib' Zlib::GzipWriter.open( "ruby.gz" ) do |chunk| chunk.write( File.read( "ruby.data.txt" )) end # of do. require 'zlib' File.open( "ruby.gz" ) do |fh| gzip = Zlib::GzipReader.new( fh ) chunk = gzip.read.split( /\n/ ) puts chunk end # of do.

  11. More ... Ruby So Far • Get the know the standard libraries • Get to know the on-line repositories • Reuse whenever possible • Share your work with others - upload your libraries to the repositories

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