Ruby is an Acceptable Lisp
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Why ruby is a practical implementation of Lisp and why is a good replacement that actually can be used in production
![User.find params[:id],
:limit => 10, :order => “name”](https://image.slidesharecdn.com/rubyisanacceptablelisp-130211065031-phpapp01/85/Ruby-is-an-Acceptable-Lisp-32-320.jpg)
![# ruby
[1,2,3].map {|n| n*n }.reject {|n| n%3==1 }
; lisp
(remove-if (lambda (n) (= (mod n 3) 1))
(mapcar (lambda (n) (* n n))
'(1 2 3)))](https://image.slidesharecdn.com/rubyisanacceptablelisp-130211065031-phpapp01/85/Ruby-is-an-Acceptable-Lisp-51-320.jpg)
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Ruby is an Acceptable Lisp
- 1. Ruby is an acceptable Lisp Vitaly Kushner astrails.com
- 2. Ruby is better then Lisp
- 3. Ruby is better then Lisp sometimes* ;-)
- 4. Language
- 6. Power
- 8. Blub Language Paradox Paul Graham http://paulgraham.com/avg.html
- 9. Is Lisp the most powerful?
- 10. NO
- 11. It depends
- 13. • syntax
- 14. • syntax • linguistic power
- 15. • syntax • linguistic power • domain
- 16. • syntax • linguistic power • domain • libraries
- 17. • syntax • linguistic power • domain • libraries • community
- 18. Ruby
- 19. History
- 20. History • Yukihiro Matsumoto (aka "Matz")
- 21. History • Yukihiro Matsumoto (aka "Matz") • Released in 1994
- 22. History • Yukihiro Matsumoto (aka "Matz") • Released in 1994 • Got known in US about 2000
- 23. History • Yukihiro Matsumoto (aka "Matz") • Released in 1994 • Got known in US about 2000 • Gained momentum around 2003-2005
- 24. more powerful than Perl more object-oriented than Python.
- 25. Perl Smalltalk Eiffel Ada Lisp
- 26. • Simple consistent syntax • Dynamically typed • Late binding • Single Inheritance with Mixin support
- 27. • Everything is an object • Closures • Garbage Collection • Multi platform
- 28. Ruby is Awesome
- 29. Clean Syntax
- 30. var # variable $var # global variable @var # instance variable @@var # class variable CONST # constant Class # class
- 31. attrs = { :src => "foo.img", :width => 100, :height => 200, :class => Avatar }
- 32. User.find params[:id], :limit => 10, :order => “name”
- 33. if @project.owned_by?(@user) return false unless @user.admin? end @project.complete!
- 36. def x_times(x, fun) for i in 1..x fun.call(i) end end x_times(10, lambda {|x| puts x})
- 37. def x_times(x) for i in 1..x yield i end end x_times(10) {|x| puts x}
- 38. def x_times(x) for i in 1..x yield i end end x_times(10) do |x| puts x end
- 39. Everything is an Object that you can extend
- 40. class Fixnum def x_times for i in 1..self yield i end end end 5.x_times { |x| puts x }
- 41. 5.times { |x| puts x }
- 42. map {|x| ...} collect {|x| ...} select {|x| ...} reject {|x| ...} find {|x| ...} any? {|x| ...} all? {|x| ...} sort {|a, b| ...}
- 44. 10.months.from_now => Thu Aug 12 03:25:40 0300 2010
- 45. 5.minutes.ago => Mon Oct 12 03:21:02 0200 2009
- 46. Closures
- 47. def incrementor(increment) proc {|x| x + increment} end >> i5 = incrementor(5) => #<Proc:0x01874a78@(irb):46> >> i5.call(3) => 8
- 48. Compact
- 49. # ruby def paidMore(amount) proc {|e| e.salary > amount} end // C# public Predicate<Employee> PaidMore(int amount) { return delegate(Employee e) { return e.Salary > amount; } }
- 50. // ruby def foo(n) lambda {|i| n+=i} end ; lisp (defun foo (n) (lambda (i) (incf n i)))
- 51. # ruby [1,2,3].map {|n| n*n }.reject {|n| n%3==1 } ; lisp (remove-if (lambda (n) (= (mod n 3) 1)) (mapcar (lambda (n) (* n n)) '(1 2 3)))
- 52. Macros
- 53. Ruby fakes macros pretty well
- 54. OO + Monkey Patching
- 55. class Person def self.defsay(sound) define_method("say_#{sound}") do puts sound end end defsay :hello defsay :hi end
- 56. >> bob = Person.new => #<Person:0x185cba8> >> bob.say_hello hello => nil >> bob.say_hi hi => nil
- 57. class Plugin < ActiveRecord::Base validates_presence_of :name validates_presence_of :description validates_presence_of :author_id belongs_to :author, :class_name => "User" has_many :plugin_versions, :dependent => :destroy belongs_to :default_version, :class_name => "PluginVersion" acts_as_commentable acts_as_taggable ... end
- 58. Magic
- 59. NoMethodError
- 60. method_missing
- 61. User.find_by_name_and_company( "Vitaly Kushner", "Astrails")
- 62. Ruby rewrite
- 63. require 'pp' require 'parse_tree' require 'parse_tree_extensions' def print_ast(&block) pp block.to_sexp end
- 64. print_ast do puts "hello" end s(:iter, s(:call, nil, :proc, s(:arglist)), nil, s(:call, nil, :puts, s(:arglist, s(:str, "hello"))))
- 65. Multiple inheritance is EVIL :-)
- 67. module FlyHome def set_home @home = position end def fly_home fly(@home) end end
- 68. class Bird < Living include FlyHome def fly(direction) ... def position ... end class Airplane < Machine include FlyHome def fly(direction) ... def position ... end
- 69. Libraries
- 70. Rubygems
- 73. Github.com
- 75. Testing
- 76. TDD
- 78. BDD
- 80. Pressure
- 81. TATFT
- 82. TATFT Test All The Fucking Time
- 83. • Test::Unit • RSpec • Shoulda • Cucumber • Webrat
- 84. it "should be able to show media" do @media = stub_media Media.stub!(:find).and_return(@media) get :show, :id => @media.id response.should be_success end
- 85. Ruby is Better then Lisp Q &A Vitaly Kushner astrails.com @astrails @vkushner