Ruby: Beauty and the Beast
IT-
www.acunote.com
?
Ruby (+Rails)
-Acunote www.acunote.com
2006-
29 000
45 500
~12000
scrum,
?
Ruby
Ruby Runtime
Garbage Collection
IDE
Ruby ?
Ruby:
!
~3-4 * ~5 = 29k ???
5-7
Ruby:
!
400 Ruby == 6000 C++
Ruby:
!
module SearchLanguageclass Parser class ParseError <
StandardError; end
def self.parse(text) parser = Parser.new parser.parse(text)
end
private: def parse_search_query parse_and_expression end
def parse_and_expression match_spaces node =
ExpressionNode.new(:and) return node if empty_buffer?
node.expressions 25
Ruby:
class Time def humanize strftime("%a %b %d, %Y %H:%M") end
end
puts Time.now.humanize > Thu Apr 21, 2011 13:37
... 28
Ruby:
class BigDecimal
alias_method :eq_without_boolean_comparison, :==
def eq_with_boolean_comparison(other) if [FalseClass,
TrueClass].include? other.class return false end
eq_without_boolean_comparison(other) end
alias_method :==, :eq_with_boolean_comparisonend
Ruby:
/
class Foo def do_smth puts "Hello World" end end
class Foo def do_smth_with_decoration puts "--------------"
do_smth_without_decoration puts "--------------" end end
f = Foo.new f.do_smth > -------------- > Hello World >
--------------
Ruby:
class Foo { private: void doSmth() { std::cout Hi
?
Ruby
Ruby Runtime
Garbage Collection
IDE
Ruby ?
Ruby:
Perl'
x = false or trueputs x #???
Ruby:
Perl'
x = false or true(x = false) or trueputs x> false
Ruby:
Perl'
x = false || truex = (false || true)puts x> true
Ruby:
Perl'
x = 2 if false or trueputs x> ?
Ruby:
Perl'
x = 2 if false or truex = 2 if (false or true)puts x> 2
Ruby:
Python'
class Fooattr_accessor :xdef do_smthx = 10endendf =
Foo.newf.x> nil#WTF?
Ruby:
Python'
class Fooattr_accessor :xdef do_smthself.x = 10endendf =
Foo.newf.x> 10
Ruby:
class Fooattr_accessor :x
def initialize@x = 10#self.x = 10y = @x#y = xendend
?
Ruby
Ruby Runtime
Garbage Collection
IDE
Ruby ?
Ruby:
:
module ActiveRecord module ConnectionAdapters class MysqlAdapter
def execute #... end end endend
module ActiveRecord module Validations def valid? errors.empty?
end end
class Base include Validations endend
Ruby:
: /
def calculate(&algorithm) yield(2, 2)end
result = calculate do |x,y| x + yend
def calculate(&expression) return unless can_calculate?
result = yield result.good? ? result : nilend
result = calculate do 2+2end
Ruby:
method_missing
class GoldenFishdef method_missing(name, *args, &block)if
name == :make_me_richputs "here you go: $1 000 000"elseputs "you
want too much!"endend end
fish = GoldenFish.newfish.make_me_rich> here you go: $1 000
000fish.make_my_old_wife_a_supermodel> you want too much!
Ruby:
Rails: method_missing
class Userhas_many :roles end
user = User.find(:first)
# user.roles.find(:all, :conditions => "name = 'Admin'")
# user.roles.map { |role| role.name }
Ruby:
Rails: method_missing
class AssociationProxydef reload@target = [1,2,3] #just for an
example end def method_missing(method, *args, &block)if
@target.respond_to? [email protected](method, *args,
&block)elseraise NoMethodErrorendendendend
p = AssociationProxy.new p.reload# p : allocated: 1049602K total
in 2052 allocations, GC calls: 146, GC time: 17281 msec
Ruby Runtime: Garbage Collection
, GChttp://blog.pluron.com/2008/02/memory-profilin.html
Ruby Runtime: Garbage Collection
:
GCGCArea Burndown 1200,940,651,5xSprint 20 x (1+5)
(C)0,590,302,0xSprint 20 x (1+5)0,700,401,8xMove
Left0,770,461,7x
Ruby 2 !"" !
Ruby Runtime: Garbage Collection
GC Ruby Enterprise Edition (www.rubyenterpriseedition.com)
-RUBY_HEAP_MIN_SLOTS=10000RUBY_HEAP_SLOTS_INCREMENT=10000RUBY_GC_MALLOC_LIMIT=8000000RUBY_HEAP_SLOTS_GROWTH_FACTOR=1.8
,
RUBY_HEAP_MIN_SLOTS=1250000RUBY_HEAP_SLOTS_INCREMENT=100000RUBY_GC_MALLOC_LIMIT=30000000RUBY_HEAP_SLOTS_GROWTH_FACTOR=1
Ruby Runtime: Garbage Collection
?JRuby
Ruby Runtime: Garbage Collection
? generational garbage collector Ruby?
?
Ruby
Ruby Runtime
Garbage Collection
IDE
Ruby ?
: IDE
Emacs (rinari, emacs-rails, ruby-mode
v23)http://oldwiki.rubyonrails.org/rails/pages/HowToUseEmacsWithRails
RubyMinehttp://www.jetbrains.com/ruby/
VIMhttp://akitaonrails.com/2009/01/04/rails-on-vim-in-english
Textmatehttp://macromates.com/
KDevelop, Aptana, Netbeans, etc, etc...
: IDE
Ruby IDE
def foo(arg)arg.endfoo(2)foo(Class.new)
: IDE
Ruby IDE
class Foo10.times do |i|define_method "great_method_#{i}".to_sym
do#...endendendf = Foo.newf.
?
Ruby
Ruby Runtime
Garbage Collection
IDE
Ruby ?
:
TDD/BDD: Test::Unit, RSpec, Cucumber, etc.
Continuous Integration: CruiseControl
(http://cruisecontrol.sourceforge.net/)
:
Test::Unit,
:
def test_file_treetree = FilesTree.new("/home/user")assert
treeassert_equal ".", tree[0], assert_equal "..",
tree[1],assert_equal "dir1", tree[2]assert_equal "file1",
tree[2][0]assert_equal "file2", tree[3]end
:
Test::Unit, :
(cucumber)
scenario: sample file treeWhen I go to /home/userThen I see
current directory, top directory, dir1There's a file2 in current
directoryThere's a file1 in dir1 directoryend
:
Test::Unit, :
(Test::Unit):
def test_file_treetree = FilesTree.new("/home/user")assert_equal
serialize_tree(tree),
