Welcome to Erlang

My First Erlang talk dedicated to beginners

Transcript

1. Welcome to Erlang
2. cystbear Erlanger Symfony expert MongoDB adept OSS doer https://twitter.com/1cdecoder https://github.com/cystbear http://trinity.ck.ua/
4. HOTCODE 2013 https://twitter.com/5ht https://synrc.com/ Maxim Sokhatskiy
5. Time to change something
6. History
7. History https://www.youtube.com/watch?
8. Specific use cases Non OOP paradigm Naive syntax No so big community Lack of libs Pros / Cons https://www.erlang-solutions.com/ https://synrc.com/ https://github.com/tapsters https://github.com/erlangbureau
9. Low level thinking! Functional Fast Robust Expressive syntax Endless running apps Update code on a fly Own Scheduler Processes based architecture Supervisor tree No shared memory Pros / Cons
10. Hey, did you heard about FP?
11. High order functions Lambda functions Separation data and functions Immutable Lazy Tail recursion Algebraic data types Pattern matching Functional https://twitter.com/nikitonsky http://tonsky.me/talks/2015-frontendconf/ http://tonsky.me/talks/2015-codefest/
12. Performance http://slides.com/maximsokhatsky/n2o
13. Scheduler http://habrahabr.ru/post/128772/ http://habrahabr.ru/post/260065/
14. Basics Integer 42 Float 4.2 aka double Atom ok Binary <<"Erlang-powa">> Reference #Ref<0.0.0.29> Pid <0.0.42> Port #Port<0.42> Fun #Fun<erl_eval.6.82930912>
15. Basics2 List [<<42,1,0,90>>, 1, ok] Tuple {<0.0.16>, 107, 42, ["madness", true]} we can force lists type and typify turples named tuples =:= records
16. Example -module(fib). -export([fib/1, tail_fib/1]). fib(0) -> 0; fib(1) -> 1; fib(N) -> fib(N - 1) + fib(N - 2).
17. Example tail_fib(N)-> tail_fib(N, 0, 0, 0). tail_fib(N, Acc, Prev, PrevPrev) -> case Acc of N -> Prev + PrevPrev; 0 -> tail_fib(N, Acc + 1, 0, 0); 1 -> tail_fib(N, Acc + 1, 1, 0); _ -> tail_fib(N, Acc + 1, Prev + PrevPrev, Prev) end.
18. Example QuickSort qsort([]) -> []; qsort([X|Xs]) -> qsort([Y || Y<-Xs, Y <= X]) ++ [X] ++ qsort([Y || Y<-Xs, Y > X]).
19. Application Examples Web Sites Rest Services Video Streaming Chats RabbitMQ Riak, CouchDB, Hibari, KAI, LeoFS, Mnesia ejabberd Cowboy Wings 3D PrivatBank Github Pages / Gist
20. Future
21. Functional Thursday