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Intro to Elixir
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Mario Alberto Chávez
November 05, 2015
Programming
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Intro to Elixir
Presentation about Elixir programming language
Mario Alberto Chávez
November 05, 2015
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Transcript
Intro to Elixir Mario Alberto Chávez @mario_chavez
Compiles to BEAM byte code Runs on Erlang VM
Concurrency
Concurrency Lightweight processes |>Are applications |>Requires a minimum of 2k
of memory |>Are supervised |>Fault-tolerant |>Garbage collected independent |>Run on multicore machines
Concurrency Actor pattern |>Receive messages |>Process data |>Talk to other
processes |>Start new processes |>Respond to messages
Concurrency Distributed
OTP is simple to design complex systems
Functional
Functional Unlearn OO |>Inmutable data |>No objects |>No classes |>No
Inheritance
Functional Functions transform data |>Small and focused |>Composable |>Repeatable |>Don’t
have side effects |>Data is passed by Value
Simple, clean, fun syntax
Atoms :ok, :accepted
Tuples { :ok, 1, “data” }
Lists [1, “data”, :ok, {“a”}]
Maps data = %{ name: “Mario”, language: “Elixir” } data.name
=> “Mario” data[:language] => “Elixir
Keywords List data = [name: “Mario”, language: “Elixir”] data[:name]
=> “Mario” data.name ** (ArgumentError) argument error
Ranges (1..5)
Functions adder = fn(a) -> fn(b) -> a + b
end end add2 = adder.(2) add.(3) => 5
Inline functions Enum.map([1, 2], fn(value) -> value * value end)
=> [1, 4] Enum.map([1, 2], &(&1 * &1)) => [1, 4]
Named functions defmodule Math do def add2(value) do value +
2 end end Math.add2(5) => 7
Pattern matching
Match operator = a = 1 => 1 1 =
a => 1 2 = a ** (MatchError) no match of right hand side value: 1 ^a = 2 ** (MatchError) no match of right hand side value: 2
Deconstruction list = [1, 3, 5, 7] [1, a |
tail] = list a => 3 tail => [5, 7]
Deconstruction data = %{ name: “Mario”, language: “Elixir” } %{
name: name } = data name => “Mario”
Multiple clauses require Integer, only: [is_odd/1] defmodule Math do def
mult(0), do: 0 def mult(x) when Integer.is_odd(x), do: x * 3 def mult(x), do: x * -3 end Math.mult(0) => 0 Math.mult(3) => 9 Math.mult(6) => -18
Functions composition
Pipeline [7, nil, 3, nil, 5, 1] |> Enum.filter(&(&1))
|> Enum.sort |> Enum.map(&(&1 * 2)) |> Enum.join(", ") => ”2, 6, 10, 14"
Many more
Metaprogramming Language extensibility |>Metaprogramming is core to Elixir |>Add new
functionality |>Create DSLs
mix Compilation and tasks tools |>Compiles code |>Execute tasks |>Creates
project template
hex package manager |>Resolves dependencies |>Install libraries
docs beautiful and complete help
Web development Phoenix Framework
Learn more Resources |>Elixir playground http://elixirplayground.com |>Slack channel for help
|>Programming Elixir Book
Intro to Elixir Mario Alberto Chávez @mario_chavez