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@elixirlang / elixir-lang.org Monday, November 19, 2012

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@josevalim Monday, November 19, 2012

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Monday, November 19, 2012

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Why? Monday, November 19, 2012

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case #1 Monday, November 19, 2012

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Switch Switch Monday, November 19, 2012

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Switch Browser Endpoint Server Monday, November 19, 2012

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Server Browser Monday, November 19, 2012

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•Web sockets •API streaming •Server sent events Server Monday, November 19, 2012

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case #2 Multi-core Monday, November 19, 2012

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Server Server Server Server Monday, November 19, 2012

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50 cores $2600 Monday, November 19, 2012

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Server Monday, November 19, 2012

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case #3 Doing it live! Monday, November 19, 2012

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http://blog.whatsapp.com/index.php/2012/01/1-million-is-so-2011/ 2 million connections on a single node Monday, November 19, 2012

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http://stackoverflow.com/questions/1636455/where-is-erlang-used-and-why Monday, November 19, 2012

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Goals Monday, November 19, 2012

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goal #1 Productivity Monday, November 19, 2012

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Everything is an expression Monday, November 19, 2012

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-module(my_module). some_function(Foo) -> % ... other_function(Bar) -> % ... erlang Monday, November 19, 2012

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-module(my_module). % won’t compile io:put_chars("hello"). some_function(Foo) -> % ... other_function(Bar) -> % ... erlang Monday, November 19, 2012

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defmodule MyModule do def some_function(foo) do # ... end IO.puts "hello" def other_function(bar) do # ... end end elixir Monday, November 19, 2012

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Macros Monday, November 19, 2012

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:foo - atoms/symbols { 1, 2, 3 } - tuples [ 1, 2, 3 ] - lists Monday, November 19, 2012

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is_atom(:foo) function line args atom { :is_atom, 1, [:foo] } Monday, November 19, 2012

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1 + 2 function line args { :+, 1, [1,2] } Monday, November 19, 2012

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defmacro unless(expr, opts) do quote do if(!unquote(expr), unquote(opts)) end end unless(true, do: exit()) elixir Monday, November 19, 2012

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Domain Specific Languages Monday, November 19, 2012

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defmodule MathTest do use ExUnit.Case test "basic operations" do assert 1 + 1 == 2 end end elixir Monday, November 19, 2012

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defmodule MathTest do use ExUnit.Case def test_basic_operations do assert 1 + 1 == 2 :ok end end elixir Monday, November 19, 2012

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assert 1 + 1 == 2 { :==, 5, [1 + 1, 2] } function line args Monday, November 19, 2012

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# assert 1 + 1 == 2 defmacro assert({ :=~, line, [l,r] }) do # ... end defmacro assert({ :==, line, [l,r] }) do # ... end defmacro assert(default) do # ... end Monday, November 19, 2012

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goal #2 Extensibility Monday, November 19, 2012

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-module(json). to_json(Item) when is_list(Item) -> % ... to_json(Item) when is_binary(Item) -> % ... to_json(Item) when is_number(Item) -> % ... erlang Monday, November 19, 2012

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Protocols Monday, November 19, 2012

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defprotocol JSON do def to_json(item) end JSON.to_json(item) elixir Monday, November 19, 2012

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defimpl JSON, for: List do # ... end elixir defimpl JSON, for: Binary do # ... end defimpl JSON, for: Number do # ... end Monday, November 19, 2012

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defimpl JSON, for: Array do # ... end elixir Monday, November 19, 2012

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goal #3 Compatibility Monday, November 19, 2012

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Monday, November 19, 2012

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DISTRIBUTED FAULT-TOLERANT APPLICATIONS WITH HOT-CODE SWAPPING Monday, November 19, 2012

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There is no conversion cost for calling Erlang from Elixir and vice-versa Monday, November 19, 2012

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• UTF-8 binaries strings • Keyword arguments • First-class documentation • First-class regular expressions • Zero-index access • ... Monday, November 19, 2012

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Example Monday, November 19, 2012

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defmodule MathTest do use ExUnit.Case, async: true test "basic operations" do assert 1 + 1 == 2 end end elixir Monday, November 19, 2012

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1 MathTest 2 SystemTest 3 ... 4 ... 5 ... 6 ... 7 ... 8 ... ExUnit. Runner ExUnit. Formatter Monday, November 19, 2012

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1 MathTest 2 SystemTest 3 ... 4 ... 5 ... 6 ... 7 ... 8 ... ExUnit. Runner run ExUnit. Formatter Monday, November 19, 2012

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1 MathTest 2 SystemTest 3 ... 4 ... 5 ... 6 ... 7 ... 8 ... ExUnit. Runner run ExUnit. Formatter Monday, November 19, 2012

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1 MathTest 2 SystemTest 3 ... 4 ... 5 ... 6 ... 7 ... 8 ... ExUnit. Runner run ExUnit. Formatter Monday, November 19, 2012

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1 MathTest 2 SystemTest 3 ... 4 ... 5 ... 6 ... 7 ... 8 ... ExUnit. Runner done ExUnit. Formatter info Monday, November 19, 2012

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1 MathTest 2 SystemTest 3 ... 4 ... 5 ... 6 ... 7 ... 8 ... ExUnit. Runner ExUnit. Formatter run Monday, November 19, 2012

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127.0.0.9 127.0.0.3 1 MathTest 2 SystemTest 3 ... 4 ... 5 ... 6 ... 7 ... 8 ... ExUnit. Runner ExUnit. Formatter Monday, November 19, 2012

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127.0.0.9 127.0.0.3 1 MathTest 2 SystemTest 3 ... 4 ... 5 ... 6 ... 7 ... 8 ... ExUnit. Runner ExUnit. Formatter ExUnit. Supervisor Monday, November 19, 2012

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Roadmap Monday, November 19, 2012

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• v0.6 (Aug/12) Erlang language compatibility • v0.8 (Dec/12) Erlang apps support • Dynamo (xx/13) Web framework • v0 (Jan/11) Monday, November 19, 2012

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Monday, November 19, 2012

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@elixirlang / elixir-lang.org Monday, November 19, 2012