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
Webの外へ飛び出せ NativePHPが切り拓くPHPの未来
takuyakatsusa
2
550
『自分のデータだけ見せたい!』を叶える──Laravel × Casbin で複雑権限をスッキリ解きほぐす 25 分
akitotsukahara
2
640
「Cursor/Devin全社導入の理想と現実」のその後
saitoryc
0
820
Python型ヒント完全ガイド 初心者でも分かる、現代的で実践的な使い方
mickey_kubo
1
110
Railsアプリケーションと パフォーマンスチューニング ー 秒間5万リクエストの モバイルオーダーシステムを支える事例 ー Rubyセミナー 大阪
falcon8823
5
1.1k
データの民主化を支える、透明性のあるデータ利活用への挑戦 2025-06-25 Database Engineering Meetup#7
y_ken
0
360
プロダクト志向ってなんなんだろうね
righttouch
PRO
0
190
地方に住むエンジニアの残酷な現実とキャリア論
ichimichi
5
1.5k
「テストは愚直&&網羅的に書くほどよい」という誤解 / Test Smarter, Not Harder
munetoshi
0
170
生成AI時代のコンポーネントライブラリの作り方
touyou
1
210
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
5.6k
システム成長を止めない!本番無停止テーブル移行の全貌
sakawe_ee
1
200
Featured
See All Featured
Learning to Love Humans: Emotional Interface Design
aarron
273
40k
Visualizing Your Data: Incorporating Mongo into Loggly Infrastructure
mongodb
46
9.6k
How GitHub (no longer) Works
holman
314
140k
Automating Front-end Workflow
addyosmani
1370
200k
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
eileencodes
35
2.4k
Making the Leap to Tech Lead
cromwellryan
134
9.4k
Designing Dashboards & Data Visualisations in Web Apps
destraynor
231
53k
Music & Morning Musume
bryan
46
6.6k
GraphQLとの向き合い方2022年版
quramy
49
14k
The World Runs on Bad Software
bkeepers
PRO
69
11k
Become a Pro
speakerdeck
PRO
29
5.4k
Adopting Sorbet at Scale
ufuk
77
9.5k
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