Erlang (GeekTalks)
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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.
![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](https://image.slidesharecdn.com/erlanggeektalks-151008201448-lva1-app6891/85/Erlang-GeekTalks-16-320.jpg)
![Example
-module(fib).
-export([fib/1]).
fib(0) -> 0;
fib(1) -> 1;
fib(N) -> fib(N - 1) + fib(N - 2).](https://image.slidesharecdn.com/erlanggeektalks-151008201448-lva1-app6891/85/Erlang-GeekTalks-17-320.jpg)
![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).](https://image.slidesharecdn.com/erlanggeektalks-151008201448-lva1-app6891/85/Erlang-GeekTalks-18-320.jpg)
![Example QuickSort
qsort([]) -> [];
qsort([X|Xs]) ->
qsort([Y || Y<-Xs, Y <= X]) ++ [X] ++ qsort([Y || Y<-Xs, Y > X]).](https://image.slidesharecdn.com/erlanggeektalks-151008201448-lva1-app6891/85/Erlang-GeekTalks-19-320.jpg)
Erlang (GeekTalks)
- 3. cystbear Erlanger Symfony expert MongoDB adept OSS doer https://twitter.com/1cdecoder https://github.com/cystbear http://trinity.ck.ua/
- 6. Time to change something
- 7. History
- 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/
- 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