Presentation starts with introduction to types and Erlang's syntax. After that it demonstrates basic support for distributed programming and finally covers parallel Erlang.

1. Learning Erlang
Ivan Yatskevich
Lead Software Engineer, EPAM

3. Learn at least one new language
every year.
Tip 8: Invest Regularly in Your
Knowledge Portfolio

8. OTP
Framework
Parallel
Erlang
Distributed
Erlang
Sequential
Erlang

9. Part I: Sequential Erlang
Data types, modules, functions, variables and pattern matching

10. Data types
• Numbers
12, 2#10, 16#FF, 2.76
• Atoms
ok, false, summer, „Wednesday‟
• Bit strings and binaries
<<“Are you sure?”>>, <<45, 19, 4>>

11. Data types (cont’d)
• Containers (Lists, Tuples)
List = [1, true, “Erlang”]
Tuple = {io, format, [“~p~n”]}
• Functions
Tripler = fun(N) -> N*3 end
• Identifiers (Refs, Pids, Ports)

12. (Fake) Data types
• Boolean
true, false
• String
“ABC” = [65, 66, 67]
• Record (≈tuple)

13. Building blocks
• Modules
• Functions
• Clauses
• Guards
• MFA
• BIFs
• Control structures
• Case, If
• Catch

14. Variables and Matching
Index ≠ Index + 1

15. { "data":
{ "translations": [
{ "translatedText": "Hallo Welt" }
]
}
}

16. Variables and Pattern Matching
Translation =
{data,
{translations, [
{translatedText, "Hallo Welt"}
]
}
}.
{data,
{translations, [
{translatedText, Text}|Tail
]
}
} = Translation.

17. Variables and Pattern Matching
Translation =
{data,
{translations, [
{translatedText, "Hallo Welt"}
]
}
}.
{_, {_, [{_, Text}|_]}} = Translation.

18. LAN
Part II: Distributed Erlang
Nodes, net_adm module, a lot of fun

19. Distributed Erlang
• Nodes
$ erl –name nyan_cat@127.0.0.1
• Cookies
$ erl –sname nyan_cat –setcookie secret
• net_adm:ping
erl> net_adm:ping(tom_cat@192.168.32.4).

20. Part III: Parallel Erlang
Processes, Pids, message passing

21. Parallel Erlang
• Processes
Pid = spawn(fun() -> hi end).
• Sending message
Pid ! {any_message, [“with”, list]}.
• Receiving message
receive
Pattern1 -> action1;
Pattern2 -> action2
after
TimeInMs ->
action_after_timeout
end.

22. Parallel Erlang (cont’d)
• self()
• make_ref()
• System process and linking
• Named process
register(name_as_atom, Pid).

23. Part IV: OTP Framework
Overview

24. OTP Framework
http://learnyousomeerlang.com/what-is-otp

25. Resources
• http://www.erlang.org
• http://www.tryerlang.org
• http://learnyousomeerlang.com
• http://www.trapexit.org/
• Programming Erlang, by Joe Armstrong
• Erlang Programming, by Francesco Cesarini and
Simon Thompson
• Erlang and OTP in Action, by Martin Logan, Eric
Merritt, and Richard Carlsson
• http://nyan.cat

26. Thank you!
Q&A