This document provides an introduction to the Erlang programming language. It discusses Erlang's functional, concurrent, and fault-tolerant capabilities. Examples are given of basic Erlang syntax including modules, functions, data types, and examples of recursive and quicksort functions. Popular applications built with Erlang like web services, chat apps, and databases are listed. Companies that use Erlang in production are also mentioned.

2. Welcome to Erlang

3. cystbear
Erlanger
Symfony expert
MongoDB adept
OSS doer
https://twitter.com/1cdecoder
https://github.com/cystbear
http://trinity.ck.ua/

5. HOTCODE 2013
https://twitter.com/5ht
https://synrc.com/
Maxim Sokhatskiy

6. Time to change something

7. History

8. History
https://www.youtube.com/watch?

9. 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

10. 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

11. Hey, did you heard about FP?

12. 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/

13. Performance
http://slides.com/maximsokhatsky/n2o

14. Scheduler
http://habrahabr.ru/post/128772/
http://habrahabr.ru/post/260065/

15. 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>

16. 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

17. Example
-module(fib).
-export([fib/1]).
fib(0) -> 0;
fib(1) -> 1;
fib(N) -> fib(N - 1) + fib(N - 2).

18. Example
-module(fib).
-export([fib/1]).
fib(N) when N > 0 -> fib(N, 1, 0, 1).
fib(1, _, _, _) -> 1;
fib(2, _, _, _) -> 1;
fib(N, N, _, Prev) -> Prev;
fib(N, C, Prev2, Prev) -> fib(N, C+1, Prev, Prev2+Prev).

19. Example QuickSort
qsort([]) -> [];
qsort([X|Xs]) ->
qsort([Y || Y<-Xs, Y <= X]) ++ [X] ++ qsort([Y || Y<-Xs, Y > X]).

20. Application Examples
Web Sites
Rest Services
Video Streaming
Chats
RabbitMQ
Riak, CouchDB, Hibari, KAI, LeoFS, Mnesia
ejabberd
Cowboy
Wings 3D
PrivatBank
Github Pages / Gist

21. Companies

22. Future

23. Cherkassy –> fprog
https://www.facebook.com/groups/Cherkassy.fprog/