Predavanje održano 18.06.2013 na Code@Sixu.

1. RUBY 2.0
Pripovjedač: Nikola Šantić

2. RUBY 2.0
MISIJA U MOSKVI
Pripovjedač: Nikola Šantić

3. Ruby je programski jezik

4. Nijedan jezik nije LOŠ
osim Visual Basica

5. Nijedan jezik nije LOŠ
osim Visual Basica
i PHPa

6. Nijedan jezik nije LOŠ
osim Visual Basica
i PHPa
i javascripta

7. Postoje LOŠI jezici

8. Ali Ruby je odličan
Stvarno

9. 11 razloga zašto je odličan

10. if (sequel == 7)
print("yes!")
end
series.push("Mission to Moscow")
title.reverse().capitalize()
1. Zagrade!
if sequel == 7
print "yes!"
end
series.push "Mission to Moscow"
title.reverse.capitalize

11. 2. if-ovi bez granica
if character == "Harris"
print "MAHONEY!!!"
end
print "MAHONEY!!!" if character == "Harris"
unless character.russian?
play_academy_theme
end

12. 3. Sve je objekt
"police academy".upcase
=> "POLICE ACADEMY"

13. 3. Sve je objekt
"police academy".upcase
=> "POLICE ACADEMY"
mission_to_moscow = Movie.new
=> #<Movie:0x00000106f95a40>

14. 3. SVE je objekt
"police academy".upcase
=> "POLICE ACADEMY"
19.years.ago
=> Sat, 18 Jun 1994 00:55:38 UTC +00:00
mission_to_moscow = Movie.new
=> #<Movie:0x00000106f95a40>

15. 4. Najljepši literali
'Ovo je string bez posebnih znakova n/'
"Ovo je policijska akademija #{ 6 + 1 }"
/police academy [0-9]+/i
oscar_reception_date = nil
us_gross = 126_247
%w(Lassard Jones Tackleberry) == ["Lassard","Jones","Tackleberry"]
{de: "Mission in Moskau", it: "Missione a Mosca",
hu: "A rendõrakadémia Moszkvában" }

16. 5. Enumeratori
(1..20).each do |i|
puts i
end

17. 5. Enumeratori
(1..20).select{|i| i.even?}
(1..20).each do |i|
puts i
end

18. 5. Enumeratori
(1..20).select{|i| i.even?}.map{|i| "Razbojnik #{i}"}
(1..20).each do |i|
puts i
end

19. 5. Enumeratori
(1..20).select{|i| i.even?}.map{|i| "Razbojnik #{i}"}.each do |i|
puts i
end
(1..20).each do |i|
puts i
end

20. 6. Zamjena dvije varijable
nikad nije bila tako laka
x, y = y, x

21. 7. Duck typing
if mission_to_moscow.respond_to?(:remake)
mission_to_moscow.remake
end

22. 8. DINAMO!
"Tackleberry".methods
=> [:==, :===, :eql?, :hash, :casecmp, :+, :*,
:%, :[], :[]=, ...

23. 8. Dinamično programiranje
"Tackleberry".methods
=> [:==, :===, :eql?, :hash, :casecmp, :+, :*,
:%, :[], :[]=, ...

24. 8. Dinamično programiranje
"Tackleberry".methods
=> [:==, :===, :eql?, :hash, :casecmp, :+, :*,
:%, :[], :[]=, ...
class Character
def speak
# bla bla
end
end
jones = Character.new
jones.speak

25. 8. Dinamično programiranje
"Tackleberry".methods
=> [:==, :===, :eql?, :hash, :casecmp, :+, :*,
:%, :[], :[]=, ...
class Character
def speak
# bla bla
end
end
jones = Character.new
jones.speak
def jones.make_noises
puts "beep! boop!"
end
jones.make_noises

26. 9. Random nasljeđivanje
class RandomSubclass < [Array, Hash, String, Fixnum, Float].sample
end

27. 10. method_missing
class RussianAcademyProxy
def initialize(academy)
@academy = academy
end
def do_russian_stuff
# ...
end
def method_missing(method, *args, &block)
@academy.send(method, *args, &block)
end
end

28. 11. Najlakše brisanje diska
IKAD
require 'fileutils'
FileUtils.rm_rf('/')

29. Navodno trebam pričati o
Rubyju 2.0

30. • Dec 1996 - 1.0
• Aug 2003 - 1.8
• Dec 2007 - 1.9.0
• Aug 2010 - 1.9.2
Povijest
FEB 24th 2013 - 2.0

31. Nije strašno.
Potpuno je kompatibilno s 1.9
Koliko je strašno?

32. Što je novo?

33. # encoding: utf-8 više ne treba!
proctooooor = "(╯°□°）╯"
Default UTF-8

34. Keyword arguments
wrap("Blue Oyster Bar")
=> "***Blue Oyster Bar***"
wrap("Blue Oyster Bar", before: "8=", after: "=>")
=> "8=Blue Oyster Bar=>"

35. Keyword arguments
Dosad:
wrap("Blue Oyster Bar")
=> "***Blue Oyster Bar***"
wrap("Blue Oyster Bar", before: "8=", after: "=>")
=> "8=Blue Oyster Bar=>"
def wrap(string, options={})
before = options[:before] || '***'
after = options[:after] || '***'
"#{before}#{string}#{after}"
end

36. Keyword arguments
Odsad:
wrap("Blue Oyster Bar")
=> "***Blue Oyster Bar***"
wrap("Blue Oyster Bar", before: "8=", after: "=>")
=> "8=Blue Oyster Bar=>"
def wrap(string, before: '***', after: '***')
"#{before}#{string}#{after}"
end

37. Module#prepend
class Character
def speak
puts "Hello"
end
include RussianCulture
end
russian = Character.new
russian.drink_votka
russian.speak
=> "Hello"
Character.ancestors
=> [Character, RussianCulture, Object, Kernel, BasicObject]
module RussianCulture
def drink_votka
end
def speak
puts "привет"
end
end

38. Module#prepend
class Character
def speak
puts "Hello"
end
prepend RussianCulture
end
russian = Character.new
russian.drink_votka
russian.speak
=> "привет"
Character.ancestors
=> [RussianCulture, Character, Object, Kernel, BasicObject]
module RussianCulture
def drink_votka
end
def speak
puts "привет"
end
end

39. Module#prepend
module RussianCulture
def speak
puts "привет"
super
puts "прощание"
end
end
russian.speak
=> "привет hello прощание"

40. class String
def russian?
match(/"p{Cyrillic}+.*?.?"/ui) ? true : false
end
end
"привет".russian? #=> true
Refinements

41. module RussianQuery
refine String do
def russian?
match(/"p{Cyrillic}+.*?.?"/ui) ? true : false
end
end
end
"привет".respond_to?(:russian?) #=> false
using RussianQuery
"привет".russian? #=> true
Refinements

42. (1..Float::INFINITY).map{|i|
i.to_s}.select{|s| s =~ /3/}.first(10)
Lazy enumerator
X_X

43. (1..Float::INFINITY).lazy.map{|i|
i.to_s}.select{|s| s =~ /3/}.first(10)
Lazy enumerator

44. • %i{first second third} == [:first, :second, :third]
• to_h
• array.bsearch{|x| x >= 4}
• __dir__
• Bolji GC
I još

45. RVM: rvm get head && rvm install 2.0.0
Kako? Gdje?
rbenv: rbenv install 2.0.0-p0

46. Hvala!