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Intro to Ruby 2.0
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Matt Aimonetti
March 07, 2013
Programming
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Intro to Ruby 2.0
Matt Aimonetti introduces Ruby 2.0 at SDRuby in Febr 2013.
Matt Aimonetti
March 07, 2013
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Transcript
ruby 2.0 San Diego Ruby - March 2013 - Matt
Aimonetti Wednesday, March 13, 13
Barney Stinson approved Wednesday, March 13, 13
Safe for Human Consumption Wednesday, March 13, 13
horse meat free Wednesday, March 13, 13
Ruby is 20 years old! Wednesday, March 13, 13
what you really need to know Wednesday, March 13, 13
Migration from Ruby 1.9 is trivial Wednesday, March 13, 13
Ruby 1.8 reaches its end of life in June Wednesday,
March 13, 13
Performance improvement Wednesday, March 13, 13
favorite Ruby Wednesday, March 13, 13
less new features Wednesday, March 13, 13
The new REE Wednesday, March 13, 13
Heroku support Wednesday, March 13, 13
Ruby 2.1 scheduled for Xmas 2013 Wednesday, March 13, 13
getting started Wednesday, March 13, 13
rvm rbenv chruby Wednesday, March 13, 13
libyaml (recent) openssl Dependencies you might need to resolve Wednesday,
March 13, 13
new in 2.0 Wednesday, March 13, 13
default code encoding Wednesday, March 13, 13
keyword arguments Wednesday, March 13, 13
# before def create(name, opts={}) opts[:tos] ||= false
opts[:timestamp] ||= Time.now end Wednesday, March 13, 13
# now def create(name, tos: false,
timestamp: Time.now) puts [name, tos, timestamp].inspect end Wednesday, March 13, 13
create("Matt") # -‐> ["Matt", false,
2013-‐03-‐06 16:34:49 -‐0800] create("Matt", timestamp: Time.now -‐ 42) # -‐> ["Matt", false, 2013-‐03-‐06 16:34:07 -‐0800] create("Matt", tos: true, location: "SDRuby") # -‐> unknown keyword: location (ArgumentError) Wednesday, March 13, 13
create("Matt", tos: true, location:
"SDRuby") # -‐> unknown keyword: location (ArgumentError) Wednesday, March 13, 13
# more flexible API def create(name, tos: false,
timestamp: Time.now, **rest) puts [name, tos, timestamp, rest].inspect end Wednesday, March 13, 13
create("Matt") # -‐> ["Matt", false,
2013-‐03-‐06 16:30:29 -‐0800, {}] create("Matt", timestamp: Time.now -‐ 42) # -‐> ["Matt", false, 2013-‐03-‐06 16:29:47 -‐0800, {}] create("Matt", tos: true, location: "SDRuby") # -‐> ["Matt", true, 2013-‐03-‐06 16:30:29 -‐0800, {:location=>"SDRuby"}] Wednesday, March 13, 13
# required keyword param def new(name,
tos: raise("TOS is required"), admin: false) end Wednesday, March 13, 13
new("Matt", tos: false) #-‐> ["Matt", false, false] new("Matt") #-‐> TOS
is required (RuntimeError) Wednesday, March 13, 13
module #prepend Wednesday, March 13, 13
# Not our code class Action def start
"just do it" end end Wednesday, March 13, 13
# The module including our modifying code module RubyIt
def start super + " better with Ruby!" end end Wednesday, March 13, 13
module RubyIt def start super +
" better with Ruby!" end end Wednesday, March 13, 13
class Action prepend RubyIt end p Action.new.start #
-‐> "just do it better with Ruby!" Wednesday, March 13, 13
lazy streams Wednesday, March 13, 13
require 'date' # Print the next 13 Friday the
13th. puts (Date.new(2013)..Date.new(9999)) .lazy .select{|d| d.day == 13 && d.friday?} .first(13) Wednesday, March 13, 13
2013-09-13 2013-12-13 2014-06-13 2015-02-13 2015-03-13 2015-11-13 2016-05-13 2017-01-13 2017-10-13 2018-04-13
2018-07-13 2019-09-13 2019-12-13 Wednesday, March 13, 13
to_h convention Wednesday, March 13, 13
Talk = Struct.new(:title, :speaker) Talk.new("Ruby 2.0", "Matt").to_h # => {:title=>"Ruby
2.0", :speaker=>"Matt"} Wednesday, March 13, 13
%i{foo bar baz} [:foo, :bar, :baz] Wednesday, March 13, 13
tracepoint support Wednesday, March 13, 13
GC/misc optimization Wednesday, March 13, 13
more... Wednesday, March 13, 13
caller_locations caller(start, length) Wednesday, March 13, 13
dtrace support Wednesday, March 13, 13
infamous refinements Wednesday, March 13, 13
Array / Range binary search Wednesday, March 13, 13
Kernel.inspect != Kernel.to_s Wednesday, March 13, 13
String#b "déjà vu".b Wednesday, March 13, 13
Thread. current. thread_variable_set("@foo", 42)
Thread. current. thread_variable_get("@foo") Thread.current.thread_variables Wednesday, March 13, 13
https://github.com/ruby/ ruby/blob/ruby_2_0_0/NEWS Wednesday, March 13, 13
@merbist http://matt.aimonetti.net Wednesday, March 13, 13