Erlang/N2O KNPMeetup

Small presentation of Erlang and N2O web framework, during KNPMeetup 2015 ( https://github.com/5HT/n2o )

Transcript

2. Disclaimer
3. Marketing
4. FP makes irreversible changes in your brain, and makes developer better.
5. HOTCODE13 MAXIM SOKHATSKIY
6. Hey, did you heard about FP?
7. My Books
8. Instant Enlightenment
9. X = 123 Immutable
10. No shared memory Paradise Shared memory Java Shared memory and state HELL Immutable
11. Message passing We need MQ No shared memory
12. Examples of Apps
13. Examples of Apps
14. Examples of Apps
15. Examples of Apps
16. Examples of Apps RabbitMQ Riak, CouchDB, Hibari, KAI, LeoFS, Mnesia ejabberd cowboy Wings 3D
17. Soft realtime
18. qsort([]) -> []; qsort([x|Xs]) -> qsort([Y || Y<-Xs, Y <= X]) ++ [x] ++ qsort([Y || Y<-Xs, Y > X]). QuickSort
19. Theory
20. Basis 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>
21. Basis 2 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
22. Pattern Matching X = 1. [H | T] = [1, 2, 3, 4]. Y = 2. Y = 3. %% err there {A, B, C} = {ok, X, [“hello”, “knp”, “symfony”]}
23. Practice
24. Small stuff on Erlang fib(0) -> 0; fib(1) -> 1; fib(N) -> fib(N - 1) + fib(N - 2).
25. Small stuff on Erlang tail_fib(N)-> tail_fib_acc(N, 0, 0, 0). tail_fib_acc(N, Counter, Prev, PrevPrev) -> case Counter of N -> Prev + PrevPrev; 0 -> tail_fib(N, Counter + 1, 0, 0); 1 -> tail_fib(N, Counter + 1, 1, 0); _ -> tail_fib(N, Counter + 1, Prev + PrevPrev, Prev) end.
26. N2O DEMO TIME
27. N2O, Idiomatic chat -module ( chat ). event (chat) -> wf:send (chat, wf:q (message) ), body () -> wf:async ( fun() -> loop() end, chat ), [ #panel { id=history }, #textbox { id=message }, #button { postback=chat } ]. loop () -> receive Message -> wf:insert_bottom ( history, #span { text=Message } ), wf:flush () end, loop ().
28. Links https://github.com/5HT/n2o http://slides.com/maximsokhatsky/n2o https://www.youtube.com/watch?v=FKPJ3C-UZJw https://github.com/synrc/kvs https://synrc.com/