Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Elixir – Belarus Ruby User Group 25 Jan 2014
Search
Sergey Nartimov
January 25, 2014
Programming
3
660
Elixir – Belarus Ruby User Group 25 Jan 2014
Sergey Nartimov
January 25, 2014
Tweet
Share
More Decks by Sergey Nartimov
See All by Sergey Nartimov
PubSub at Rails
lest
0
120
Rails in production - RubyConfBY 22 Mar 2015
lest
1
150
Sequel - BRUG 21 Feb 2015
lest
0
82
Authentication Security – RUBYSPB
lest
2
170
Geospatial applications on Rails
lest
8
410
Design patterns – Belarus Ruby on Rails User Group 23 Feb 2013
lest
8
650
Ruby Stdlib – Minsk.rb October 2012
lest
10
360
Background jobs with realtime results – RailsClub'Moscow 2012
lest
5
210
Other Decks in Programming
See All in Programming
スタートアップの急成長を支えるプラットフォームエンジニアリングと組織戦略
sutochin26
1
7.3k
明示と暗黙 ー PHPとGoの インターフェイスの違いを知る
shimabox
2
620
状態遷移図を書こう / Sequence Chart vs State Diagram
orgachem
PRO
2
200
AI駆動のマルチエージェントによる業務フロー自動化の設計と実践
h_okkah
0
230
AIと”コードの評価関数”を共有する / Share the "code evaluation function" with AI
euglena1215
1
180
「App Intent」よくわからんけどすごい!
rinngo0302
1
100
Porting a visionOS App to Android XR
akkeylab
0
680
The Modern View Layer Rails Deserves: A Vision For 2025 And Beyond @ RailsConf 2025, Philadelphia, PA
marcoroth
2
730
Quand Symfony, ApiPlatform, OpenAI et LangChain s'allient pour exploiter vos PDF : de la théorie à la production…
ahmedbhs123
0
220
Git Sync を超える!OSS で実現する CDK Pull 型デプロイ / Deploying CDK with PipeCD in Pull-style
tkikuc
4
350
ISUCON研修おかわり会 講義スライド
arfes0e2b3c
1
470
CDK引数設計道場100本ノック
badmintoncryer
2
480
Featured
See All Featured
Fireside Chat
paigeccino
37
3.5k
10 Git Anti Patterns You Should be Aware of
lemiorhan
PRO
656
60k
Put a Button on it: Removing Barriers to Going Fast.
kastner
60
3.9k
Code Reviewing Like a Champion
maltzj
524
40k
Navigating Team Friction
lara
187
15k
The World Runs on Bad Software
bkeepers
PRO
70
11k
GraphQLとの向き合い方2022年版
quramy
49
14k
It's Worth the Effort
3n
185
28k
The Psychology of Web Performance [Beyond Tellerrand 2023]
tammyeverts
48
2.9k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
32
2.4k
The Straight Up "How To Draw Better" Workshop
denniskardys
235
140k
Understanding Cognitive Biases in Performance Measurement
bluesmoon
29
1.8k
Transcript
Elixir Сергей Нартымов Brainspec https://github.com/lest twitter: @just_lest
Elixir is a metaprogrammable, functional language built atop the Erlang
VM.
Elixir
Metaprogramming
Metaprogramming iex> nil?(1) false iex> nil?(nil) true defmacro nil?(x) do
quote do: unquote(x) == nil end
Metaprogramming iex> nil?(1) false iex> nil?(nil) true defmacro nil?(x) do
quote do: unquote(x) == nil end
Metaprogramming if(foo, do: bar, else: baz) if foo do bar
else baz end
Metaprogramming defmacro unless(clause, options) do do_clause = Keyword.get(options, :do, nil)
else_clause = Keyword.get(options, :else, nil) quote do if(unquote(clause), do: unquote(else_clause), else: unquote(do_clause)) end end
Metaprogramming Lisps traditionally empowered developers because you can eliminate anything
that’s tedious through macros, and that power is really what people keep going back for. — Rich Hickey
Functions
Function capture iex> list = ["foo", "bar", "baz"] ["foo","bar","baz"] iex>
Enum.map list, fn(x) -> size(x) end [3,3,3] iex> Enum.map list, &size/1 [3,3,3] iex> fun = &rem(&1, 2) #Function<6.80484245 in :erl_eval.expr/5> iex> fun.(4) 0
Function capture iex> list = ["foo", "bar", "baz"] ["foo","bar","baz"] iex>
Enum.map list, fn(x) -> size(x) end [3,3,3] iex> Enum.map list, &size/1 [3,3,3] iex> fun = &rem(&1, 2) #Function<6.80484245 in :erl_eval.expr/5> iex> fun.(4) 0
Partial application iex> list = ["foo", "bar", "baz"] ["foo","bar","baz"] iex>
Enum.map list, fn(x) -> size(x) end [3,3,3] iex> Enum.map list, &size/1 [3,3,3] iex> fun = &rem(&1, 2) #Function<6.80484245 in :erl_eval.expr/5> iex> fun.(4) 0
Pipeline operator
f3(f2(f1(state))) state |> f1 |> f2 |> f3
f3(f2(f1(state))) state |> f1 |> f2 |> f3
list |> Enum.filter(&(&1 > 0)) # take positive numbers |>
Enum.map(&(&1 * &1)) # square each one |> Enum.reduce(0, &(&1 + &2)) # calculate sum
Polymorphism
Protocols
Protocols defprotocol Inspect do def inspect(thing, opts) end defimpl Inspect,
for: Atom do def inspect(false), do: "false" def inspect(true), do: "true" def inspect(nil), do: "nil" def inspect(atom) do # ... end end
Protocols defimpl Inspect, for: List do # ... end defimpl
Inspect, for: Integer do # ... end
ExUnit A unit test framework
ExUnit ExUnit.start defmodule MyTest do use ExUnit.Case test "the truth"
do assert true end end $ elixir assertion_test.exs
ExUnit ExUnit.start defmodule MyTest do use ExUnit.Case test "the truth"
do assert true end end $ elixir assertion_test.exs
ExUnit assert 1 + 1 == 2 refute 1 +
3 == 3 assert 1 + 1 == 3 # Expected 2 to be equal to (==) 3
Mix A build tool
Mix defmodule MyProject.Mixfile do use Mix.Project def project do [
app: :my_project, version: "0.0.1", deps: deps ] end # Configuration for the OTP application def application do [] end defp deps do [] end end
Mix defp deps do [ { :some_project, github: "some_project/other", tag:
"0.3.0" }, { :another_project, ">= 1.0.2", git: "https://example.com/another/repo.git" } ] end
Other
Other • Unicode strings
Other • Unicode strings • String sigils, heredocs
Other • Unicode strings • String sigils, heredocs • Documentation
Other • Unicode strings • String sigils, heredocs • Documentation
• List comprehentions
Resources • http://elixir-lang.org/ • http://joearms.github.io/2013/05/31/a-week- with-elixir.html • http://www.theerlangelist.com/2014/01/ why-elixir.html •
http://devintorr.es/blog/2013/06/11/elixir- its-not-about-syntax/
Спасибо https://github.com/lest twitter: @just_lest Сергей Нартымов Brainspec