Rubyists! Have a sip of Elixir!

This talk is about Elixir – a functional, meta-programming aware language built on top of the Erlang VM.

I introduce some of Elixir's more interesting language features. Then I will demonstrate some of the features that Erlang gives Elixir for free, such as the OTP framework, that let's you build fault tolerant and distributed systems.

So come along and join me to experience programming joy.

Transcript

1. Rubyists: Have a sip of Elixir RUBYCONF | 18 Nov 2014 | SAN DEIGO BENJAMIN TAN WEI HAO @BENTANWEIHAO
3. Thanks!
4. We are (always!) hiring! Thanks!
20. Backstory
21. Joe Armstrong, Erlang inventor
22. Mike Williams Robert Virding Bjarne Dacker
23. Switch
24. Switch
25. Switch
26. Switch
27. Switch Switch Switch
28. Who uses Erlang
30. ✔ Standard Library ✔ Tooling ✔ Metaprogramming ✔ Syntax ✔ Interoperability
31. why learn Elixir
32. TOOLS the ✔ Interactive Elixir ✔ mix build tool
33. iex
34. mix
35. PIPE Operator the *Awesome*
36. The Pipe operator
37. The Pipe operator FAIL:
38. The Pipe operator FAIL: WITH PIPES:
39. WITH PIPES: WITH PIPES + SYNTAX SUGAR!
40. WITH PIPES: WITH PIPES + SYNTAX SUGAR! Function Capture
41. A Real World EXAMPLE OUTPUT:
42. A Real World EXAMPLE
43. A Real World EXAMPLE
44. A Real World EXAMPLE
45. A Real World EXAMPLE
46. A Real World EXAMPLE
49. Concurrency model Actor
50. 1. is a Process An Actor:
51. 1. is a Process 2. performs a specific task An Actor:
52. 1. is a Process 2. performs a specific task 3. can send and receive a message An Actor:
53. 1. is a Process 2. performs a specific task 3. can send and receive a message 4. responds to specific types of messages An Actor:
54. 1. is a Process 2. performs a specific task 3. can send and receive a message 4. responds to specific types of messages 5. no shared memory with other processes An Actor:
55. processes THE BASIC CONCURRENCY PRIMITIVE
56. This is a Process <0.88.0>
57. <0.88.0> This is a Process ID (pid)
58. a Process communicates <0.81.0> by sending messages <0.88.0> send <0.81.0>, “OHAI”
59. a Process communicates <0.81.0> <0.88.0> send <0.88.0>,“WASSAP” and receiving messages.
61. hello ACKERMANN A CONCURRENCY DEMO
62. The Ackermann function
63. The Ackermann function
64. The Ackermann function
65. The Ackermann function
68. .
69. Step 1: spawn a Process
70. Step 1: spawn a Process <0.61.0>
71. <0.61.0> Step 2: Send a Message send w1, {1, 2}
72. <0.61.0> Step 2: Send a Message send w1, {1, 2}
73. <0.61.0> Step 2: Send a Message send w1, {1, 2}
74. <0.61.0> Step 2: Send a Message send w1, {1, 2}
75. <0.61.0> Step 2: Send a Message send w1, “LOLWUT”
76. <0.61.0> Step 2: Send a Message send w1, “LOLWUT”
82. fault tolerance STAYING UP WHEN SH*T HAPPENS
83. Supervisor A Supervision Tree Worker
84. Supervisor A Supervision Tree hierachy Worker
85. <0.81.0> Supervisor: Detected <0.81.0> died!
86. Supervisor: Restart child! <0.88.0>
87. <0.81.0> Supervisor: Detected <0.81.0> died!
88. <0.81.0> Supervisor: Kill, kill, kill!!! <0.79.0> <0.80.0>
89. Supervisor: Restart all the children! <0.88.0> <0.89.0> <0.90.0>
90. Supervisor: Restart all the children! <0.88.0> <0.89.0> <0.90.0>
93. let’s build HTTP LOAD TESTER
94. AN Example Run of Blitzy
95. AN Example Run of Blitzy
97. The Protocol Coordinator Process n = 3 # = 0 Coordinator: I need to handle 3 workers. I have received messages from 0 workers.
98. The Protocol Coordinator Process Worker Process send ,{:ok,5000} Worker: Hey Coordinator, yahoo.com took 5000 msecs. <0.81.0> n = 3 # = 0
99. The Protocol Coordinator Process Coordinator: Ok, now I have 2 more workers to hear from. n = 3 # = 1
100. The Protocol Coordinator Process Worker Process send ,{:error, :404} Worker: Hey Coordinator, yahoo.com errored out. <0.83.0> n = 3 # = 1
101. The Protocol Coordinator Process Coordinator: Ok, now I have 1 more worker to hear from. n = 3 # = 2
102. A Serial HTTP LOAD TESTER
103. Worker Process http://www.yahoo.com |> HTTP Client
104. HTTP Client http://www.yahoo.com |> {:ok, %{status_code: 200}} {:error, %{reason: :timeout}}
105. HTTP Client http://www.yahoo.com |> {:ok, %{status_code: 200}} |> do_request/2 {:ok, 5000}
106. HTTP Client http://www.yahoo.com |> |> do_request/2 {:error, %{reason: :timeout}} {:error,:timeout}
107. HTTP Client http://www.yahoo.com |> |> do_request/2 {:error, %{reason: :404}} {:error,:unknown}
109. {:error,:timeout} {:ok, 5000} n = 3 # = 1
110. Coordinator Process
111. Coordinator Process Hi, I am Coordinator. n = 3 # = 0
113. n = 3 # = 3 BASE CASE: ! ! ! ! ! ! PROCESSED WORKERS == NUMBER OF WORKERS SAME VALUE!
114. {:ok, 5000} n = 3 # = 1
115. {:error,:timeout} n = 3 # = 1
116. Running the program
117. Running the program
118. TASKS EXECUTING COMPUTATIONS ASYNCHRONOUSLY
119. Tasks Example
120. Tasks Example
121. Running the program n = 3 # = 0
122. Running the program n = 3 # = 0 worker 1
123. Running the program n = 3 # = 1 worker 2
124. Running the program n = 3 # = 2 worker 3
125. Running the program n = 3 # = 3 RESULT: 2 succeeded, 1 failure.
127. A Concurrent HTTP LOAD TESTER
128. Running the program
129. Serial: Concurrent:
130. Running the program n = 3 # = 0 worker 1 worker 2 worker 3
132. A Distributed HTTP LOAD TESTER
133. Erlang Runtime System Erlang Runtime System A B C send(B,  Msg) Network
134. Erlang Runtime System Erlang Runtime System A B C send(C, Msg) Network
135. Running the program
136. Running the program MASTER
137. Running the program MASTER SLAVE 1 SLAVE 2 SLAVE 3
138. Running the program
139. Running the program
140. Running the program
141. Running the program
144. Running the program
145. Running the program
149. Chris McCord! @chrismccord
150. http://www.elixirsips.com
153. http://benjamintanweihao.github.io
155. Coming Soon-ish!
156. HEATHER MILLER for the slide designs I stole. Credits My HUI LING, for letting me ignore her. http://misterjazzz.deviantart.com/art/Constructicons-with-Prowl-C-446618997 http://thisotplife.tumblr.com http://battlefordreamisland.wikia.com/ Image Credits Network by Brennan Novak from The Noun Project Fork by Dmitry Baranovskiy from The Noun Project
157. Fin. Questions? Thank you! BENJAMIN TAN WEI HAO @BENTANWEIHAO