Functional Programming With Elixir
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Elixir is a functional, concurrent, general-purpose programming language that runs on the Erlang virtual machine. It was created by José Valim and is influenced by Erlang. Elixir uses immutable data, isolated processes, and message passing for concurrency. It has a syntax similar to Ruby but with features like pattern matching, pipes, and first-class functions. Elixir's lightweight processes and fault-tolerance make it suitable for building distributed, concurrent systems. Its growing ecosystem includes tools like Phoenix for building web applications.
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![Elixir’s Syntax - Types
Integer 1234 0xcafe 0177 0b100 10_000
Float 1.0 3.1415 6.02e23
Atom :foo :me@home :"with spaces"
Tuple { 1, 2, :ok, "xy" }
List [ 1, 2, 3 ] or [head | tail]
Keyword List [ a: "Foo", b: 123 ]
Map %{ key => value, key => value }
Truth true, false, nil
Range a..b
6](https://image.slidesharecdn.com/functionalprogrammingwithelixir-160823015455/85/Functional-Programming-With-Elixir-6-320.jpg)
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LinkedIn: https://www.linkedin.com/in/anishkumar/
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🔧 Integration of IoT and AI to enable rapid response and minimize incident impact
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Functional Programming With Elixir
- 1. Functional Programming With Elixir Nguyen Anh Tien
- 2. Table of Contents ● What is Elixir ? ● Functional Programming ● Why Elixir ? ● Syntax of Elixir ● Elixir’s Ecosystem ● Q & A 2
- 3. What is Elixir ? ● Functional, Concurrent, General Purpose ● Created by José Valim @ Plataformatec ○ Former Rails Core Team member ○ Author of Crafting Rails 4 Application ● Run on Erlang VM ● Stable release: 1.3.1 ● Used by: Pinterest, Dockyard, Bleacher Report, ... 3
- 4. What is Elixir ? - Erlang ● Developed by Ericsson, ~1986 ● Same characteristic as Elixir ● Used in Telephone Applications ● BEAM VM ○ A virtual machine to run Erlang ○ Interfaces to the “outside” world ● Backed of WhatApp, Amazon’s SimpleDB, ... ○ http://highscalability.com/blog/2014/2/26/the-whatsapp-architecture-facebook-bought-for-19 -billion.html ○ https://blog.whatsapp.com/196/1-million-is-so-2011 ● Battle-tested ! 4
- 5. Functional vs Imperative Programming ● Modules ● Immutable ● Pure functions ○ No side-effect ● Stateless ? ● Declarative ○ Expressions ● Erlang, Haskell, Clojure, ... ● Objects ● Mutable ● Methods ○ Can have side-effect ● Stateful ● Imperative ○ Statements ● Python, Ruby, Java 5
- 6. Elixir’s Syntax - Types Integer 1234 0xcafe 0177 0b100 10_000 Float 1.0 3.1415 6.02e23 Atom :foo :me@home :"with spaces" Tuple { 1, 2, :ok, "xy" } List [ 1, 2, 3 ] or [head | tail] Keyword List [ a: "Foo", b: 123 ] Map %{ key => value, key => value } Truth true, false, nil Range a..b 6
- 7. Elixir’s Syntax - Ruby like 7
- 8. Elixir’s Syntax ● First class functions - High order functions ○ Functions that can either take other functions as arguments or return them as results ○ Macro ○ Homoiconicity ● Anonymous functions Data Function Function Data transformation transformation 8
- 9. Elixir’s Syntax - Pipe operator (1) ● |> ○ passes the result of an expression as the first parameter of another expression. ● First argument: Data to transform ● Function composing ● Normal (bad) code 9
- 10. Elixir’s Syntax - Pipe operator (2) ● Nested code ● Pipe code 10
- 11. Elixir’s Syntax - Pattern Matching (1) ● the = operator is actually a match operator -> binding + rebinding 11
- 12. Elixir’s Syntax - Pattern Matching (2) ● Function signature matching 12
- 13. Elixir’s Syntax - Looping ● Looping through recursion, tail-call ● Iteration ○ Enum.reduce ○ Enum.map ○ Enum.filter ○ ... 13
- 14. Why Elixir ? Processes ● Processes ○ Lightweight, low cost (~1KB) ○ Isolated, concurrent ○ Thousand of processes ● Communication by message-passing ○ Inbox ● Connect to other node in another computer ● -> Distributed 14
- 15. Why Elixir ? Fast (1) ● Data copying ○ -> inefficient ? ● Garbage Collector ○ Processes have separated heap ○ No synchronisation ● Robert Virding - Hitchhiker's Tour of the BEAM ○ https://www.youtube.com /watch?v=_Pwlvy3zz9M 15
- 16. Why Elixir ? Fast (2) ● Let’s see some benchmark ○ https://github.com/mroth/ phoenix-showdown 16
- 17. Why Elixir ? Fault-tolerant (1) ● Todo Server Example ○ Everyone have a Todo ○ Todo: List of todo items ● Use cache when DB isn’t reachable ● One user’s todo list do not affect other’s todo list 17
- 18. Why Elixir ? Fault-tolerant (2) ● “Let it crash” ● Link and Monitor ● OTP ● Supervisor Trees - GenServer ● Restart Strategy ○ one_for_one ○ simple_one_for_one ○ rest_for_one 18
- 19. Elixir’s Ecosystem ● Hex - The package manager for the Erlang ecosystem ● Mix - Elixir’s build tool ○ = Rake + Bundler + RubyGems ● Call outside program via Ports or NIF 19
- 20. Elixir’s Ecosystem ● Productive - Reliable - Fast ● MVC model, Plug based ● Live reload coding ● Websocket integrated ○ http://www.phoenixframework.org/blog/the-road-to-2-million-websocket-c onnections ○ https://dockyard.com/blog/2016/08/09/phoenix-channels-vs-rails-action- cable ● More and more app migration from Rails to Phoenix ○ https://speakerdeck.com/bcardarella/fro m-rails-to-phoenix 20
- 21. Learning Resources ● Elixir Getting Started ● Elixir Schools ● ElixirConf @ youtube ● #elixir @ confreaks.tv ● exercism.io ● vietnamrb.slack.com ● Elixir-lang.slack.com ● Erlang stuffs ! ● ... 21
- 22. Q & A 22
- 23. 23 Thank you !