Ruby on Ales

A brief introduction on to Ruby, highlighting its expressiveness and readability with some comparisons to Objective C.

Companion notes - http://git.io/P1lA5w

1. @kierangraham @brewbot
2. Why Ruby?
3. Writing code is difficult
4. Errors / Debugging / Despair Read Docs / Stack Overflow Presenting Data Getting Data Your Idea You
5. Errors / Debugging / Despair Read Docs / Stack Overflow Presenting Data Getting Data Your Idea You
6. Errors / Debugging / Despair Read Docs / Stack Overflow Presenting Data Getting Data Your Idea You
7. Errors / Debugging / Despair Read Docs / Stack Overflow Presenting Data Getting Data Your Idea You
8. Errors / Debugging / Despair Read Docs / Stack Overflow Presenting Data Getting Data Your Idea You
9. Writing code is * *Ruby makes it nicer
10. Ruby is expressive What you expect to happen is usually what happens
11. Ruby is readable Reading code like a machine isn’t so nice
12. Ruby is for people There’s plenty of other languages optimised for machines
13. Brewbot.brew! do recipe "Ruby on Ales" do ingredient :water ingredient malts: [ "British Pale Ale Malt", "Crystal Malt", "Munich Malt" ] ! ingredient hops: ["Colombus", "Cascade"] end end !
14. –Someone “But I can already do these things in [x] language, see!”
15. +++++ +++++ initialize counter (cell #0) to 10 [ use loop to set the next four cells to 70/100/30/10 > +++++ ++ add 7 to cell #1 > +++++ +++++ add 10 to cell #2 > +++ add 3 to cell #3 > + add 1 to cell #4 <<<< - decrement counter (cell #0) ] > ++ . print 'H' > + . print 'e' +++++ ++ . print 'l' . print 'l' +++ . print 'o' > ++ . print ' ' << +++++ +++++ +++++ . print 'W' > . print 'o' +++ . print 'r' ----- - . print 'l' ----- --- . print 'd' > + . print '!' > . Hello World!
16. [“Pun<tu@t|on”] (‘vomit’);
17. Comparing to Objective-C* *This is a totally ridiculous comparison I know
18. beers = ["Rochefort 8", "Carlsberg"] + ["Pliny the Elder", "Harp"] => ["Rochefort", "Carlsberg", "Pliny the Elder", "Harp"] ! nice_beers = beers - ["Carlsberg", "Harp"] => ["Rochefort", "Pliny the Elder”] ! nice_beers = nice_beers + ["The Kernel Pale Ale"] => ["Rochefort", "Pliny the Elder", "The Kernel Pale Ale"] Arrays in Ruby
19. NSMutableArray *beers = [@[@"Rochefort 8", @"Carlsberg", @"Pliny the Elder", @"Harp"] mutableCopy]; => ["Rochefort", "Carlsberg", "Pliny the Elder", “Harp"] ! NSMutableArray *nice_beers = [beers mutableCopy]; [nice_beers removeObjectsInArray:@[@"Carlsberg", @"Harp"]]; => ["Rochefort", "Pliny the Elder"] ! [nice_beers addObject:@"The Kernel Pale Ale"]; => ["Rochefort", "Pliny the Elder", "The Kernel Pale Ale"] Arrays* in Objective-C
20. nice_beers.each do |beer| puts "I like " + beer end ! => I like Rochefort 8 => I like Pliny the Elder => I like The Kernel Pale Ale => ["Rochefort 8", "Pliny the Elder", "The Kernel Pale Ale"] Arrays and Blocks in Ruby
21. [nice_beers enumerateObjectsUsingBlock: ^(NSString *beer, NSUInteger idx, BOOL *stop) { NSLog(@"I like %@", beer); }]; ! => I like Rochefort 8 => I like Pliny the Elder => I like The Kernel Pale Ale Arrays and Blocks in Objective-C
22. Beer.create name: "Ruby on Ales" Saving models using Ruby on Rails
23. NSManagedObjectContext *managedContext = [NSManagedObjectContext new]; Beer *beer = [Beer createInContext:managedContext]; beer.name = @"Ruby on Ales"; NSError *error = nil; [managedContext save:&error]; Saving models in Objective-C using Core Data
24. Quick and Simple Tasks with Ruby Write a script or use irb
25. 2.0.0-p353 :002 > 2 + 2 => 4 2.0.0-p353 :003 > [1,2,3,4] + [5,6,7,8] => [1, 2, 3, 4, 5, 6, 7, 8] 2.0.0-p353 :004 > irb - Interactive Ruby Shell
26. Gems 2,620,319,971 downloads of 69,904 gems
27. Community Ruby community holds high quality, well documented, well tested code very dearly
28. How do I setup Ruby?
29. Is your text editor Sublime? Sublime Text is an amazing editor on Mac, Windows and Linux
30. On Mac* (and Linux) *My preferred environment
31. The Terminal iTerm 2 is a replacement for the built-in Terminal.app
32. Your Mac comes preinstalled with Ruby but… …you should avoid it
33. sudo is bad Leave the system alone and get your own Ruby!
34. RVM can help Ruby Version Manager lets you have multiple Rubies installed beside but isolated from each other
35. On Windows* *I don’t really use Windows so your mileage may vary.
36. RubyInstaller rubyinstaller.org
37. Learning Ruby
38. Pick something you already use in [insert language]… …and try porting it to Ruby
39. See what exists already in Ruby How does your port compare?
40. Learn by example; read code What ways are other people writing Ruby?
41. Read about Ruby Read blogs, documentation, tweets
42. Write in Ruby Starting is the hardest part
43. Thanks Enjoy some of the Ruby on Ales beer specially brewed for Belfast Ruby by Brewbot ! @kierangraham @brewbot