Elixir: Ruby flavored Erlang

Transcript

1. Ruby flavored Erlang
2. Who am I? • Danilo Roberto Gonçalves • Developer at • https://github.com/danxexe • Rubyist since 2006
3. • 1.0 released in December 13, 2005 • 2.0 released in December 7, 2007
4. • Japan: July 22, 2004 • Worldwide: September 16, 2005 • Ruby 1.81
5. What changed?
6. http://www.internetlivestats.com/internet-users/ The Internet keeps growing
7. http://goo.gl/upU9AO The free lunch is over
8. –Yukihiro 'Matz' Matsumoto “I don't consider myself as the threading guy” “Matz is nice and so we are nice” “Matz is not a threading guy so we are not a threading guy”
9. Concurrency in Ruby • Native threads since 1.9 (MRI) • Global Interpreter (VM) Lock • JRuby and Rubinius • No good Ruby spec
10. Threads suck
11. Threads suck • Race conditions • Deadlocks • Locks are hard to use correctly • Hard to debug • Shared resources are the core most problems
12. Actor Model • Message passing • Share nothing • Inherently concurrent, easily distributed • "Object oriented" as Alan Kay intended
13. Implementations • Ruby: Celluloid (https://celluloid.io) • Python: Pykka (https://www.pykka.org) • Java / Scala: Akka (https://akka.io) • Those are fine, but…
14. Erlang • THE Actor Model implementation • Lightweight VM processes • Functional language • Immutable data • Pattern matching • Hot code swapping • OTP - Open Telecom Platform • Battle tested by telecom industry (99.9999999% availability)
15. Why not Erlang then?
16. Why not Erlang then?
17. Erlang annoyances • Weird, inconsistent syntax • Terrible string handling • Immutable variables + Lisp-like inside-out expressions • Crappy code organisation • Hard to get started
18. Enter Elixir
19. Uniform, "Ruby-like" syntax
20. Pipeline operator Erlang Elixir • DRY • Natural data flow
21. Metaprogramming • Done via “hygienic macros” • Run code at compile time • Transform and generate code • Erlang compatible AST • Features implemented in Elixir via macros • if / unless, using, quote / unquote, assert, … • Even defmacro and def are implemented via macros
22. Consistent standard library • Organize functions inside modules • String, Process, Node, System, … • Normalize param order • Remove boilerplate • GenServer, Agent, Taks, … • Polymorphism via protocols • Enum, Dict, Stream, …
23. Awesome tooling • IEx • Doctests • Mix • Hex
24. All the power of OTP • Supervisor chains • GenServer • ETS • Mnesia • Hot code swapping
25. Awesome libraries • https://github.com/phoenixframework/phoenix • https://github.com/elixir-lang/ecto • https://github.com/elixir-lang/plug • https://github.com/myfreeweb/httpotion • https://github.com/sasa1977/exactor • https://github.com/h4cc/awesome-elixir
26. Should I start using it now? YES
27. How do I get started? • http://learnxinyminutes.com/docs/elixir/ • http://elixir-lang.org • https://pragprog.com/book/elixir/programming-elixir • http://learnyousomeerlang.com/content
28. –Damien Katz, CouchDB creator “There are the languages everyone complains about, and there are the languages no one uses.”