Update from the Elixir team - 2018

Transcript

1. Update from the Elixir team
   elixir-lang.org
   

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2. @whatyouhide
   

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5. weedmaps.com/careers
   

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6. Elixir v1.0
   Sep 2014
   > 180 contributors
   

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7. Elixir v1.6
   Jan 2018
   > 730 contributors
   

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8. • Follow two- to three-part commands: "Put your book
   away, brush your teeth, and then get in bed."
   • Recognize familiar word signs such as "STOP"
   • Better understand the concept of time
   • Count ten or more objects
   • Correctly name at least four colors and three shapes
   Elixir 1.0 is almost 4yo
   

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9. Release every 6 months
   v1.5 → mid 2017
   v1.6 → beg 2018
   v1.7 →
   

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10. IMPROVEMENTS IN v1.6
    

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12. Code formatter
    

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13. def foo (
    a, b ) do a+ b
    end
    def foo(a, b) do
    a + b
    end
    

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14. Feature complete
    formats code
    is configurable (for some things)
    supports formatting entire Mix projects (.formatter.exs)
    

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16. Dynamic supervisor
    

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17. simple_one_for_one
    confusing/mixed API
    documentation
    

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18. opts = [strategy: :one_for_one]
    {:ok, sup} = DynamicSupervisor.start_link(opts)
    DynamicSupervisor.start_child(
    sup,
    {Agent, fn -> %{} end}
    )
    

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19. "Just like simple_one_for_one but actually simple"
    

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20. Documentation
    

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21. @deprecated/@since
    @doc "Breaks a collection into chunks"
    @since "1.0.0"
    @deprecated "Use chunk_every/2 instead"
    def chunk(collection, chunk_size) do
    chunk_every(collection, chunk_size)
    end
    

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22. @deprecated/@since
    @doc "Breaks a collection into chunks"
    @since "1.0.0"
    @deprecated "Use chunk_every/2 instead"
    def chunk(collection, chunk_size) do
    chunk_every(collection, chunk_size)
    end
    

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23. @deprecated/@since
    @doc "Breaks a collection into chunks"
    @since "1.0.0"
    @deprecated "Use chunk_every/2 instead"
    def chunk(collection, chunk_size) do
    chunk_every(collection, chunk_size)
    end
    

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24. Library guidelines
    

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25. Compatibility table with Erlang/OTP
    

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26. Table of deprecations
    

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27. UX
    

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28. --slowest N
    $ mix test --slowest 2
    Finished in 1.4 seconds
    Top 3 slowest (0.9s), 61.0% of total time:
    * test client suicide (602.8ms) (RedixTest)
    * test unable to connect (201.2ms) (RedixTest)
    * test timeouts (101.8ms) (RedixTest)
    

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29. 10-20% compilation speedup with OTP21
    definitely thanks to us
    

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30. defguard
    

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31. defguard is_drinking_age(age) when age >= 21
    def serve_drink(%User{age: age})
    when is_drinking_age(age) do
    # Serve the drink
    end
    

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32. FUTURE
    

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34. StreamData
    data generation
    property-based testing
    +
    

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35. Enum.take(StreamData.integer(), 2)
    #=> [1, -2]
    

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36. use ExUnitProperties

    property "bin1 <> bin2 always starts with bin1" do
    check all bin1 <- binary(),
    bin2 <- binary() do
    assert String.starts_with?(bin1 <> bin2, bin1)
    end
    end
    

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37. only stateless testing...
    ...but discussion started
    for stateful testing
    

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38. __STACKTRACE__
    

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39. try do
    apply(mod, fun, args)
    catch
    :error, val ->
    {:error, {val, __STACKTRACE__}}
    end
    

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40. Configuration and releases
    

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41. Solve problems with Mix.Config
    Streamline releases and integrate with Mix
    

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42. Docs chunk
    

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43. EEP 48
    documentation storage and format
    

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44. Standard API for all BEAM languages
    Access to docs in the shell
    +
    (Elixir already has this)
    

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45. RESEARCH PROJECTS
    

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46. Google Summer of Code
    

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47. StreamData + typespecs
    

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48. Enum.take(from_type(timeout/0), 3)
    #=> [0, :infinity, 927]
    @type timeout() :: non_neg_integer() | :infinity
    

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49. check all arg1 <- from_type(timeout/0) do
    result = my_fun(arg1)
    assert is_integer(result)
    end
    @spec my_fun(timeout()) :: integer()
    

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50. ElixirBench
    

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51. mix dialyzer
    

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52. TensorflEx: Tensorflow bindings for Elixir
    

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53. github.com/elixir-lang/elixir
    

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54. elixir-lang.org
    

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