Bootstrap |> Elixir - Easy fun for busy developers
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The document provides an overview of the Elixir programming language. It discusses key features of Elixir like processes, concurrency, fault tolerance using supervision trees, and distribution across nodes. It also briefly compares Elixir to other languages like Ruby, Erlang, and Clojure, highlighting reasons why one may choose each. The document demonstrates concepts like GenServers, testing with ExUnit, and macros. Overall it promotes Elixir as a good choice for building scalable and fault tolerant applications.
![[1, 4, 9, 16, 25, 36, 49, 64, 81, 100,
121, 144, 169, 196, 225, 256, 289, 324,
361, 400, 441, 484, 529, 576, 625, 676,
729, 784, 841, 900, 961, 1024, 1089,
1156, 1225, 1296, 1369, 1444, 1521,
1600, 1681, 1764, 1849, 1936, 2025, 2116,
2209, 2304, 2401, 2500, ...]
100000 Processes](https://image.slidesharecdn.com/elixir-for-busy-java-devs-160708111038/85/Bootstrap-Elixir-Easy-fun-for-busy-developers-17-320.jpg)
![Compile-time structural decomposition
def sqrt([h | t]), do: …
iex> sqrt([1, 2, 3, 4 ])](https://image.slidesharecdn.com/elixir-for-busy-java-devs-160708111038/85/Bootstrap-Elixir-Easy-fun-for-busy-developers-29-320.jpg)
![Testing documentation
@doc """
iex> sieve(10)
[2, 3, 5, 7]
"""
def sieve(n) do
...
end
defmodule Test do
use ExUnit.Case
doctest
…
end](https://image.slidesharecdn.com/elixir-for-busy-java-devs-160708111038/85/Bootstrap-Elixir-Easy-fun-for-busy-developers-49-320.jpg)
![Hygienic Macros
defmacro time([do: body]) do
quote do
s = :os.system_time(…)
unquote(body)
f = :os.system_time(…)
info(“Took #{s-f} ms")
end
end
time do
IO.puts "Something"
:timer.sleep(100)
end
[info] Took 101 ms](https://image.slidesharecdn.com/elixir-for-busy-java-devs-160708111038/85/Bootstrap-Elixir-Easy-fun-for-busy-developers-50-320.jpg)
Bootstrap |> Elixir - Easy fun for busy developers
- 1. Bootstrap EASY FUN FOR BUSY DEVELOPERS |> Elixir
- 3. DON’T RUN AWAY Elixir is special!
- 4. Elixir in a Nutshell = + Elixir in a Nutshell +
- 5. PROGRAMMERS OFTEN FEEL JOY WHEN THEY CAN CONCENTRATE ON THE CREATIVE SIDE OF PROGRAMMING, SO RUBY IS DESIGNED TO MAKE PROGRAMMERS HAPPY. I CONSIDER A PROGRAMMING LANGUAGE AS A USER INTERFACE, SO IT SHOULD FOLLOW THE PRINCIPLES OF USER INTERFACE. Yukihiro Matsumoto, Ruby Inventor Why Ruby is awesome
- 6. Principle of Conciseness Principle of Consistency Principle of Flexibility Why Ruby is awesome
- 7. THE AXD301 HAS ACHIEVED A NINE NINES RELIABILITY (YES, YOU READ THAT RIGHT, 99.9999999%). LET’S PUT THIS IN CONTEXT: 5 NINES IS RECKONED TO BE GOOD (5.2 MINUTES OF DOWNTIME/YEAR). 7 NINES ALMOST UNACHIEVABLE ... BUT WE DID 9. Joe Armstrong, Erlang Designer Why Erlang is awesome
- 8. Battle-proven BEAM and OTP Ever seen WhatsApp crash? Reactive before Reactive-is-HipTm Actors before Actors-are—HipTm Why Erlang is awesome
- 9. Why Clojure is awesome Because Rich Hickey is always right
- 10. SO…WHY NOT DO RUBY, ERLANG OR CLOJURE?
- 11. WHY NOT USE RUBY? SPEED, CONCURRENCY, SCALABILITY
- 12. WHY NOT USE ERLANG? SYNTAX, BAROQUE TOOLING
- 13. WHY NOT USE CLOJURE? …NO REASON, REALLY. GO AHEAD USE IT!
- 14. Scalability, lightweight Threads Fault-tolerance, Supervisor Functional, immutable DSLs using Meta-Programming Mix, Hex, ExUnit,… REPL for easy learning Why Elixir is awesome
- 15. Scalability, lightweight Threads Fault-tolerance, Supervisor Functional, immutable DSLs using Meta-Programming Mix, Hex, ExUnit,… REPL for easy learning Why Elixir is awesome
- 16. 100000 Processes 1..100_000 |> Enum.map(&(Task.async( fn -> &1 * &1 end ))) |> Enum.map(&Task.await/1)
- 17. [1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225, 256, 289, 324, 361, 400, 441, 484, 529, 576, 625, 676, 729, 784, 841, 900, 961, 1024, 1089, 1156, 1225, 1296, 1369, 1444, 1521, 1600, 1681, 1764, 1849, 1936, 2025, 2116, 2209, 2304, 2401, 2500, ...] 100000 Processes
- 18. 1..100_000 |> Enum.map(&(Task.async( fn -> &1 * &1 end ))) |> Enum.map(&Task.await/1) ?what? 100000 Processes
- 20. Creating a project $ mix new demo $ cd demo $ mix test
- 21. Read Eval Print Loop $ iex -S mix Erlang/OTP 18 … Interactive Elixir (1.2.4) - press Ctrl+C to exit (type h() ENTER for help) iex(1)> IO.puts “Hello Elixir” Hello Elixir :ok
- 22. Transform - don’t mutate 10 |> fib |> IO.puts IO.puts(fib(10)) transformation pipeline
- 23. Declaring functions def fib(0), do: 0 def fib(0) do 0 end (n-1) + fib(n-2) end same thing
- 24. Pattern matching def fib(0), do: 0 def fib(1), do: 1 def fib(n) when n > 1 iex> fib(1) pattern matching
- 25. Guard expressions def fib(n) when n > 1 do fib(n-1) + fib(n-2) end guard expression
- 26. iex> fib(-3) ** (FunctionClauseError) no function clause matching in fib/1 (fibnew) lib/fib2.ex:2: fib(-3) Things go wrong
- 27. Anonymous functions fn n -> n + 2 end &( &1 + 2 ) same thing
- 28. Function shortcuts IO.puts/2 def puts(device, item) /2 denotes the number of args
- 29. Compile-time structural decomposition def sqrt([h | t]), do: … iex> sqrt([1, 2, 3, 4 ])
- 30. Show me the code Demo
- 31. ELIXIR APPLICATION DESIGN APPLICATIONS, SUPERVISORS, PROCESSES
- 32. Shared resources Shared state Shared stability PROCESS SHARED STATE
- 33. Shared nothing Message passing PROCESS PROCESS PROCESS PROCESS PROCESS PROCESS PROCESS PROCESS PROCESS PROCESS PROCESS PROCESS PROCESS
- 34. Abstractions for Resilience Agent…abstractions around state GenServer…long-running, messaging Supervisor…let it crash Application…just think component
- 35. Abstractions for Resilience Agent…abstractions around state GenServer…long-running, messaging Supervisor…let it crash Application…just think component
- 36. Message-based design using GenServer BA GenServer.start_link {:ok, #PID<0.112.0>}
- 37. Message-based design using GenServer BA GenServer.call(B, {:sum, 1..3})
- 38. Message-based design using GenServer BA handle_call({:sum, 1..3}, from, state)
- 39. Message-based design using GenServer BA {:reply, {:ok, 6}, new_state)
- 40. GenServer Demo
- 42. Move risk to the bottom of the supervision tree APPLICATION SUPERVISOR WORKER C WORKER A WORKER B Here be dragons… FILE IO DB ACCESS
- 43. Supervisors watch their children APPLICATION SUPERVISOR WORKER C WORKER A WORKER B :one_for_one!
- 44. :one_for_one replaces failed process APPLICATION SUPERVISOR WORKER C WORKER A WORKER B WORKER B’ Auto-restart
- 45. Supervisor Demo
- 46. Processes are distributed across nodes PROCESS PROCESS PROCESS PROCESS PROCESS PROCESS PROCESS PROCESS PROCESS PROCESS PROCESS PROCESS PROCESS :”one@foo” :”two@foo”
- 48. MORE COOL FEATURES TEASERS ONLY
- 49. Testing documentation @doc """ iex> sieve(10) [2, 3, 5, 7] """ def sieve(n) do ... end defmodule Test do use ExUnit.Case doctest … end
- 50. Hygienic Macros defmacro time([do: body]) do quote do s = :os.system_time(…) unquote(body) f = :os.system_time(…) info(“Took #{s-f} ms") end end time do IO.puts "Something" :timer.sleep(100) end [info] Took 101 ms
- 51. There is so much more
- 52. Protocols Sigils Umbrella projects Ecto Phoenix Hot code replacement
- 53. SHOULD WE ALL START BUILDING EVERYTHING WITH ELIXIR?
- 56. New insights and ideas Clean patterns Architecture for IoT Vibrant Community
- 57. 学⼀一⻔门语⾔言，就是多⼀一个观察世界的窗户。 To learn a language is to have one more window from which to look at the world
- 58. Elixir Homepage, http://elixir-lang.org/ Dave Thomas, Programming Elixir Fred Hebert, Stuff Goes Bad: Erlang in Anger José Valim, Introduction to Elixir https:// youtu.be/41PvAPSX0wg Slides + Code, https://git.io/vKUGc Do you want to know more?
- 59. Thank you very much! <david.schmitz@senacor.com> @koenighotze