Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Ruby 2.0 Walkthrough: The Best Bits
Search
Peter Cooper
February 25, 2013
Programming
67
11k
Ruby 2.0 Walkthrough: The Best Bits
A quick overview of a few of the best bits in Ruby 2.0.
Peter Cooper
February 25, 2013
Tweet
Share
More Decks by Peter Cooper
See All by Peter Cooper
The Future of Code
peterc
0
140
Redis Steady Go (Nov 2012)
peterc
18
1.2k
I Choo-Choo Choose The Web: A History of the Web and JavaScript 1945-2012
peterc
1
190
Redis Steady Go
peterc
31
2.2k
Other Decks in Programming
See All in Programming
20251016_Rails News ~Rails 8.1の足音を聴く~
morimorihoge
2
480
The Past, Present, and Future of Enterprise Java
ivargrimstad
0
410
iOSエンジニア向けの英語学習アプリを作る!
yukawashouhei
0
200
「ちょっと古いから」って避けてた技術書、今だからこそ読もう
mottyzzz
11
6.8k
Foundation Modelsを実装日本語学習アプリを作ってみた!
hypebeans
0
120
チームの境界をブチ抜いていけ
tokai235
0
180
Go Conference 2025: Goで体感するMultipath TCP ― Go 1.24 時代の MPTCP Listener を理解する
takehaya
9
1.7k
Range on Rails ―「多重範囲型」という新たな選択肢が、複雑ロジックを劇的にシンプルにしたワケ
rizap_tech
0
6.7k
The Past, Present, and Future of Enterprise Java
ivargrimstad
0
430
技術的負債の正体を知って向き合う
irof
0
180
CSC509 Lecture 04
javiergs
PRO
0
300
One Enishi After Another
snoozer05
PRO
0
110
Featured
See All Featured
Embracing the Ebb and Flow
colly
88
4.9k
Building Flexible Design Systems
yeseniaperezcruz
329
39k
Balancing Empowerment & Direction
lara
5
690
Let's Do A Bunch of Simple Stuff to Make Websites Faster
chriscoyier
508
140k
Measuring & Analyzing Core Web Vitals
bluesmoon
9
620
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
PRO
190
55k
Evolution of real-time – Irina Nazarova, EuRuKo, 2024
irinanazarova
9
980
Bootstrapping a Software Product
garrettdimon
PRO
307
110k
Visualizing Your Data: Incorporating Mongo into Loggly Infrastructure
mongodb
48
9.7k
GraphQLとの向き合い方2022年版
quramy
49
14k
Agile that works and the tools we love
rasmusluckow
331
21k
GitHub's CSS Performance
jonrohan
1032
470k
Transcript
RUBY 2.0 WALKTHROUGH
The Best Bits THE RUBY 2.0 RUNTHROUGH
A sprint, not a stroll
BIG PARTS
Refinements Experimental scope-limited monkey patching
module FloatDivision refine Fixnum do def /(other); self.to_f / other;
end end end class MathFun using FloatDivision def self.ratio(a, b) a / b end end p MathFun.ratio(6, 8) THE OLD IDEA (no longer works)
module FloatDivision refine Fixnum do def /(other); self.to_f / other;
end end end class MathFun using FloatDivision def self.ratio(a, b) a / b end end p MathFun.ratio(6, 8)
module FloatDivision refine Fixnum do def /(other); self.to_f / other;
end end end using FloatDivision class MathFun def self.ratio(a, b) a / b end end p MathFun.ratio(6, 8) Main context is OK
Keyword Arguments definitely a: “pretty”, good: “addition”, to: “the language”
def some_method(options = {}) defaults = { x: 10, y:
20, z: 30 } options = defaults.merge(options) p options end some_method x: 1, y: 2
def some_method(x: 10, y: 20, z: 30) p x, y,
z end some_method x: 1, y: 2, z: 3
def some_method(x: 10, **rest) p x, rest end some_method x:
1, y: 2, z: 3, c: “x”
Enumerator::Lazy Lazy enumeration, finally made easy.
infinite_range = (0..Float::INFINITY) infinite_range.select { |num| num % 74 ==
0 }
infinite_range = (0..Float::INFINITY) e = infinite_range.lazy.select { |num| num %
74 == 0 } puts e.next puts e.next puts e.next
Module#prepend
module Bar def my_method "inside the module" end end class
Foo include Bar def my_method "inside the class" super end end x = Foo.new p x.my_method 1 2
module Bar def my_method "inside the module" super end end
class Foo prepend Bar def my_method "inside the class" end end x = Foo.new p x.my_method 1 2
INCLUDE PREPEND Foo class Bar module x object NEITHER Foo
class x object Object class Object class Foo class Bar module x object Object class
DETAILS
ABI Breakage Changes to the Application Binary Interface
Regex engine changed From Oniguruma to Onigmo
%{this\r\nis\n\ncool\vhello!}.gsub(/\R/, '')
RubyGems 2.0 Lots of refactoring, initial support for stdlib gemification,
gem search is now remote, arbitrary metadata support & more.
RDoc 4.0 Adds Markdown support & ri can now show
pages (e.g. READMEs with ri rdoc:README)
%i and %I To form arrays of symbols, like %w
does for words and arrays
%i{a b c} == [:a, :b, :c] %I{ #{(rand(26) +
65).chr} } == [:Y]
UTF-8 is default source encoding No more # encoding: utf-8
(if you don’t want)
Bitmap garbage collector Faster, more efficient
CSV.load and CSV.dump gone Not considered such a good idea
in light of the early 2013 YAML vulnerabilities
String#chars, #lines, #codepoints, etc. Now return arrays rather than enumerators.
Use #each_char, #each_line, etc. instead if you need enumerators.
TracePoint A more object oriented alternative to set_trace_func
tracer = lambda do |event, file, line, id, binding, klass|
to_display = [event, File.basename(file), line, klass, id] puts "%10s in %s at line %-2d %s:%s" % to_display end set_trace_func tracer # .. normal code here ..
tracer = TracePoint.new do |tp| to_display = [tp.event, File.basename(tp.path), tp.lineno,
tp.defined_class, tp.method_id] puts "%10s in %s at line %-2d %s:%s" % to_display end tracer.enable # .. normal code here ..
respond_to? respond_to? against a protected method now returns false
Method transplants with define_method Now accepts UnboundMethods
module M def foo; "foo"; end end define_method :foo, M.instance_method(:foo)
p foo
Array#bsearch Range#bsearch Binary search for monotonic collections
[1, 4, 9, 13, 14, 22, 40].bsearch { |i| p
i; i >= 6 } # 13 # 4 # 9 # => 9 (1..1000).bsearch { |i| i > 372 }
__dir__ Like __FILE__ but for the current source file’s directory
Equivalent to File.dirname(File.realpath(__FILE__))
to_h and Hash() A new convention. The hash equivalent to
#to_a A key use is with Struct and OpenStruct
User = Struct.new(:name, :age, :status) me = User.new("Peter", 31, :admin)
me.to_h ENV.to_h Hash(nil) # => {} Hash([]) # => {}
FIN https://cooperpress.com/