Getting started with ruby

Transcript

1. 1.

   Getting started with ruby Eindhoven.rb #4 — 5 april 2011

   Arjan van der Gaag
2. 2.

   Getting started with Ruby Eindhoven.rb #4 — 5 april 2011

   Arjan van der Gaag
3. 3.

   Getting started with Ruby Eindhoven.rb #4 — 5 april 2011

   Arjan van der Gaag
4. 4.

   Getting started with ruby Eindhoven.rb #4 — 5 april 2011

   Arjan van der Gaag
5. 5.

   None
6. 6.

   $ ruby app.rb

7. 7.

   $ ruby app.rb $ ruby -r “mylib” app.rb

8. 8.

   $ ruby app.rb $ ruby -r “mylib” app.rb $ ruby

   -rubygems app.rb
9. 9.

   $ ruby app.rb $ ruby -r “mylib” app.rb $ ruby

   -rubygems app.rb $ ruby -I lib app.rb
10. 10.

    # lib/post.rb class Post attr_accessor :title, :author end # app.rb

    require "post" get '/' do @posts = Post.all erb :index end $ ruby -rubygems -r sinatra -I lib app.rb
11. 11.

    None
12. 12.

    $ ruby -e ‘puts “Hello, world”’

13. 13.

    $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb

14. 14.

    while gets # execute app.rb here end

15. 15.

    while $_ = gets # execute app.rb here end

16. 16.

    $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb

17. 17.

    $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb

    $ ruby -p app.rb
18. 18.

    while gets # execute app.rb here print end

19. 19.

    while $_ = gets # execute app.rb here print $_

    end
20. 20.

    $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb

    $ ruby -p app.rb
21. 21.

    $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb

    $ ruby -p app.rb $ ruby -lpe app.rb
22. 22.

    while gets $_.chomp! # execute app.rb here print end

23. 23.

    $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb

    $ ruby -p app.rb $ ruby -lpe app.rb
24. 24.

    $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb

    $ ruby -p app.rb $ ruby -lpe app.rb $ ruby -pe “next unless /<{7}/../>{7}/” conflicted_file
25. 25.

    $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb

    $ ruby -p app.rb $ ruby -lpe app.rb $ ruby -pe “next unless /<{7}/../>{7}/” conflicted_file $ ruby -an -F, -e ‘puts $F[0]‘ csv_file
26. 26.

    while gets $F = $_.split $, # execute app.rb here

    end
27. 27.

    $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb

    $ ruby -p app.rb $ ruby -lpe app.rb $ ruby -pe “next unless /<{7}/../>{7}/” conflicted_file $ ruby -an -F, -e ‘puts $F[0]‘ csv_file
28. 28.

    $ ruby -e ‘puts “Hello, world”’ $ ruby -n app.rb

    $ ruby -p app.rb $ ruby -lpe app.rb $ ruby -pe “next unless /<{7}/../>{7}/” conflicted_file $ ruby -an -F, -e ‘puts $F[0]‘ csv_file $ ruby -i -p -e ‘$_.downcase!’ file
29. 29.

    #!/usr/bin/env ruby -w # Example input: # # john,secret #

    graham,test require 'digest' while line = ARGF.gets("\n") do parts = line.split ',' next unless parts[1] print line.gsub parts[1], Digest::SHA1.hexdigest(parts[1]) end
30. 30.

    #!/usr/bin/env ruby -wanp -r digest -F, next unless $F[1] gsub

    $F[1], Digest::SHA1.hexdigest($F[1])
31. 31.

    # Read all values in ARGV as files as #

    a single stream OR read from STDIN puts ARGF.read puts $<.read
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    - $/ input record separator (default \n) - $\ output

    record separator (default \n) - $, output field separator (default nil) - $; input field separator (default nil) - $_ current line - $. number of current line - $F result of $_.split($;) Ruby globals
33. 33.

    - OptParse - StrScanner - OpenStruct - Set - CSV

    - Find - FileUtils - Tmpfile - Zlib - Abbrev Know your StdLib
34. 34.

    None
35. 35.

    $ ruby -h

36. 36.

    github.com/avdgaag @avdgaag