Pinball Elixir

Pinball Elixir with Adrian P. Dunston

@bitcapulet Purpose To get you excited about Elixir. 2

@bitcapulet Purpose To get you excited about Elixir. So you’ll
be more powerful. 3

be more powerful. So your companies will start using it. 4

be more powerful. So your companies will start using it. So my friends and I have more Elixir jobs available. 5

be more powerful. So your companies will start using it. So my friends and I have more Elixir jobs available. Because I'm excited about Elixir. 6

@bitcapulet Story Time! 7

@bitcapulet Story Time! Kevin McAbee 8

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@bitcapulet Story Time! Kevin McAbee 12

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Adrian P. Dunston adrian@bitcapulet.com @bitcapulet 17 joinpapa.com

18 Adrian P. Dunston adrian@bitcapulet.com @bitcapulet 18 joinpapa.com

@bitcapulet What is essential? 19

@bitcapulet State complexity clearly. Steal from telephony. 20

@bitcapulet Elixir does two things very well. 21

@bitcapulet If you state your complexity clearly, it's easier to
solve complex problems. 22

solve complex problems. Distributed systems = complex problems 23

solve complex problems. Functional programming forces this. 24

solve complex problems. This is what ELIXIR brings to the table. 25

@bitcapulet Rob those phone companies blind! 26

@bitcapulet Rob those phone companies blind! 16 years of searching
and building. 27

and building. THEN 20 years of open-source improvements. 28

and building. THEN 20 years of open-source improvements. 29 Now a fresh new language built on top!

@bitcapulet State complexity clearly. 30

@bitcapulet State complexity clearly. Steal from telephony. 31

@bitcapulet Magic Matching State complexity clearly. 32

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@bitcapulet 42 43

@bitcapulet 'a' 44

@bitcapulet [1,2] 45

@bitcapulet :ok 46

@bitcapulet :ok ? 47

@bitcapulet :ok :oj :ol 48

@bitcapulet :ok :oj :ol :error :erroq :erros :adrian :adriam :adriao
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@bitcapulet Plunger 52

@bitcapulet Plunger 53

@bitcapulet Plunger Playfield 54

@bitcapulet Plunger Playfield Drain 57

@bitcapulet Plunger Playfield Drain 58

@bitcapulet def run(ball) do ball end 59

@bitcapulet def run(ball) do ball; end 60

@bitcapulet def run(ball) do return ball; end 61

@bitcapulet def run(ball) do ball end Drain 62

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@bitcapulet def run(a,b,c,d) do # ummm... end 67

@bitcapulet def run(a,b,c,d) do [d,c,b,a] end 68

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@bitcapulet [ , , , ] 74

@bitcapulet [ , , , ] a b c d
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def get_odd(list) do a = Enum.at(list, 0) c = Enum.at(list, 2) [a, c] end 76

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@bitcapulet [a, b, c, d] [ , , , ]
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@bitcapulet [ , , , ] [ , , ,
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@bitcapulet [ , , , ] [ , , ,
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@bitcapulet [ , , , ] [ , , ,
] 81

@bitcapulet [ , , , ] [ , , ,
] 82

def get_odd(list) do a = Enum.at(list, 0) c = Enum.at(list, 2) [a, c] end 83

def get_odd(list) do [a, b, c, d] list [a, c] end 84

def get_odd(list) do [a, _, c, _] list [a, c] end 85

def get_odd(list) do [a, _b, c, _d] list [a, c] end 86

@bitcapulet Captive Ball 87

@bitcapulet Multiball!! 88

@bitcapulet Kicker 89

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@bitcapulet %{name: "Adrian"} 92

@bitcapulet %{name: "Adrian"} jsObject = {"name": "Adrian"} 93

@bitcapulet Map<Integer,String> map = new HashMap<Integer,String>(); map.put("name","Adrian"); 94

@bitcapulet %{name: "Adrian"} 95

@bitcapulet %{ name: "Adrian", age: 40, fav_capt: "Picard" } 96

@bitcapulet human = %{ name: "Adrian", age: 40, fav_capt: "Picard"
} 97

@bitcapulet human = %{ name: "Adrian", age: 40, fav_capt: "Picard"
} 98

@bitcapulet human = %{ name: , age: , fav_capt: }
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@bitcapulet human 100

@bitcapulet %{name: var} human 101

@bitcapulet %{name: var} "Adrian" human 105

@bitcapulet def get_name(map) do %{name: var} map var end 106

@bitcapulet def get_name(map) do %{name: var} map var end get_name(%{})
107

@bitcapulet get_name(%{}) 108

@bitcapulet get_name(%{}) %{} 109

@bitcapulet %{} Cookie Monster CONFIRMED!! 110

@bitcapulet %{ } Cookie Monster CONFIRMED!! 111

@bitcapulet %{0} Cookie Monster CONFIRMED!! 112

@bitcapulet %{*} Cookie Monster CONFIRMED!! 114

@bitcapulet %{.} Cookie Monster CONFIRMED!! 116

@bitcapulet %{} Me love it! 118

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** (MatchError) no match of right hand side value: %{} 121

@bitcapulet %{} What you mean let process fail?! 122

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** (MatchError) no match of right hand side value: %{} 125 Not just for getting values!

@bitcapulet %{name: _, age: _, fav_capt: _ } my_map 126

@bitcapulet %{"name" => _, "age" => _, "fav.capt." => "Picard"
} my_map %{name: _, age: _, fav_capt: "Picard" } my_map 127

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} my_map %{name: _, age: _, fav_capt: "Picard" } my_map 129

} my_map [ %{fav_capt: "Kirk"}, %{fav_capt: "Picard"}, %{fav_capt: "Sisko"}, %{fav_capt: "Janeway"}, ] list_of_maps 130

} my_map [ %{fav_capt: "Kirk"}, %{fav_capt: "Picard"}, %{fav_capt: "Sisko"}, %{fav_capt: "Janeway"}, %{fav_capt: ["Kirk", "Sisko"] ] list_of_maps_with_lists 131

} my_map [ %{fav_capt: "Kirk", age: var}, %{fav_capt: "Picard"}, %{fav_capt: "Sisko"}, %{fav_capt: "Janeway"}, %{fav_capt: ["Kirk", "Sisko"] ] list_of_maps_with_lists 132

@bitcapulet [ , , , ] [ , , ,
] 133 VALUES!

@bitcapulet [ , , , ] [ , , ,
] 134 VALUES!

@bitcapulet [ , , , ] [ , , ,
] 135 VALUES!

@bitcapulet [ , , , ] [ , , ,
] 136 VALUES!

@bitcapulet [ , , , ] [ , , ,
] 137 VALUES!

@bitcapulet138 FORMATS!

@bitcapulet139 values in deep structures too!

@bitcapulet = 140

@bitcapulet >%{} Of course it equal sign! Everyone guess that!
Why you use clipart in first place? 141

@bitcapulet {:ok, "Jean-Luc Picard"} = get_fav_capt(human) 142

@bitcapulet {:ok, "Jean-Luc Picard"} = get_fav_capt(human) 143

@bitcapulet cookie = "delicious" 144

@bitcapulet cookie = "delicious" %{} Okay. This me can get
behind. 145

@bitcapulet case 2 + 2 4 -> "hurray" 3 ->
"oops" end 146

@bitcapulet case do_math(2) 4 -> "hurray" 3 -> "oops" end
147

@bitcapulet case do_math(2) 4 -> "hurray" 3 -> "oops" var
-> "Got number: #{var}" end 148

-> "Got number: #{var}" end 149

-> "Got number: #{var}" [1, 2, 3] -> "123 list" end 150

-> "got number: #{var}" [1, 2, 3] -> "123 list" end 151

-> "got number: #{var}" [1, 2, 3] -> "123 list" end [ , , , ] 1 2 3 152

@bitcapulet case 4 -> "hurray" 3 -> "oops" var ->
"got number: #{var}" [1, 2, 3] -> "123 list" end 156

[1, 2, 3] -> "123 list" end 165

[1, 2, 3] -> "123 list" end 166

[1, 2, 3] -> "123 list" end 167

[1, 2, 3] -> "123 list" end 168

[1, 2, 3] -> "123 list" end 169

[1, 2, 3] -> "123 list" end 170

@bitcapulet case do_math(2) 4 -> "hurray" 3 -> "oops" [1,
2, 3] -> "123 list" var -> "got number: #{var}" end 173

@bitcapulet case do_math(2) 4 -> "hurray" 3 -> "oops" [1,
2, 3] -> "123 list" var -> "got number: #{var}" end 174

@bitcapulet %{} That long section. 175

@bitcapulet %{} That long section. Me need break. 176

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@bitcapulet Beam Processes Steal from telephony. 182

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@bitcapulet 134 Million Processes 194

@bitcapulet defmodule MyModule def phil(state) do phil(state + 1) end
end 204

@bitcapulet defmodule MyModule def phil(state) do receive do value ->
IO.puts("count: " <> state) IO.puts("Phil got: " <> value) end phil(state + 1) end end 205

@bitcapulet Interactive Elixir (1.6.1) - press Ctrl+C to exit (type
h() ENTER for help) iex(1)> 206

@bitcapulet Interactive Elixir (1.6.1) - press Ctrl+C to exit (type
h() ENTER for help) iex(1)> IO.puts("Hello, world!") Hello, world! :ok iex(2)> 207

@bitcapulet iex(2)> pid = spawn(MyModule, :phil, 0) #PID<0.97.0> iex(3)> 208

@bitcapulet iex(2)> pid = spawn(MyModule, :phil, 0) #PID<0.97.0> iex(3)> Process.alive?(pid)
true iex(4)> 209

true iex(4)> send(pid, "hello") count: 0 Phil got: hello "hello" iex(5)> 210

true iex(4)> send(pid, "hello") count: 0 Phil got: hello "hello" iex(5)> send(pid, "hello") count: 1 Phil got: hello "hello" 211

@bitcapulet spawn receive send 212 Built right into the language!

@bitcapulet A process is a recursive function that holds state
and lives at an address with a mailbox. <0.194.0> 213

@bitcapulet >%{} We back in OO-land! 214

@bitcapulet >%{} We back in OO-land! How this not just
uglier-Java?! 215

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@bitcapulet x x 217

@bitcapulet x x x x x x x x x
x x x x x 218

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@bitcapulet %{} Break time 232

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@bitcapulet Function Signatures State complexity clearly. 238

@bitcapulet def run(a,b,c,d) do [d,c,b,a] end 240 Uneven

@bitcapulet def run(list) do [a,b,c,d] = list [d,c,b,a] end 241

What if > 4 items?

@bitcapulet run([1,2,3,4,5]) ** (MatchError) no match of right hand side
value: [1, 2, 3, 4, 5] 243

object?

@bitcapulet {tuple} 245

@bitcapulet quartet = {1,2,3,4} trio = {"one", 2, %{}} 246

@bitcapulet def run(tuple) do {a,b,c,d} = tuple {d,c,b,a} end 247

@bitcapulet def run(tuple) do {a,b,c,d} = tuple {d,c,b,a} end 248

@bitcapulet def run({a,b,c,d}) do {d,c,b,a} end 249

@bitcapulet def run(tuple = {a,b,c,d}) do IO.inspect(tuple) {d,c,b,a} end 250

@bitcapulet def run(tuple = {a,b,c,d}) do IO.inspect(tuple) {d,c,b,a} end 251
Now reverse 5!

@bitcapulet def run(tuple = {a,b,c,d}) do IO.inspect(tuple) {d,c,b,a} end def
run(tuple = {a,b,c,d,e}) do IO.inspect(tuple) {e,d,c,b,a} end 252

@bitcapulet This is why Java has factories! 259

@bitcapulet GenServer Steal from telephony. 260

@bitcapulet A process is a recursive function that holds state
and lives at an address with a mailbox. <0.194.0> 261

@bitcapulet A GenServer is like a Starfleet officer 262

@bitcapulet defmodule Phil do IO.puts("Phil got: " <> value) end
263

@bitcapulet defmodule Phil do use GenServer def init(_args), do: 0
def handle_cast(value, from, state) do IO.puts("Phil got: " <> value) {:noreply, state + 1} end end 264

def handle_cast(value, from, state) do IO.puts("Phil got: " <> value) {:noreply, state + 1} end def handle_call(:say_something, from, state) do {:reply, "something", state} end end 268

@bitcapulet {:ok, pid} = GenServer.start_link(Phil, "arg") def init(_args), do: 0
Spawn a GenServer 269

@bitcapulet Asynchronous requests def handle_cast(value, from, state) do IO.puts("Phil got:
" <> value) {:noreply, state + 1} end GenServer.cast(pid, "a present") move_right_along() 270

@bitcapulet def handle_call(:say_something, from, state) do IO.puts("Phil got: " <>
value) {:reply, "Thanks", state} end Synchronous requests reply = GenServer.call(pid, :say_something) 271

@bitcapulet Synchronous requests reply = GenServer.call(pid, :say_something) 272 PID passing
gets old

@bitcapulet GenServer.start_link(Phil, "arg", name: :phil) Fee pid Registry 273

@bitcapulet GenServer.start_link(Phil, "arg", name: :phil) GenServer.cast(:phil, "a present with your
name on it") Fee pid Registry 274

@bitcapulet GenServer.start_link(Phil, "arg", name: :phil) GenServer.cast(:phil, "a present with your
name on it") pid = Process.whereis(:phil) Fee pid Registry 275

@bitcapulet Supervisors 276

@bitcapulet Supervisors 277

@bitcapulet defmodule CaptJoan do use Supervisor def init(_args) do children
= [ {Phil, []} ] Supervisor.init(children, strategy: :one_for_one) end end 278

= [ {Phil, []}, {Phil, []}, {Phil, []} ] Supervisor.init(children, strategy: :one_for_one) end end 281

= [ {Phil, []}, {Phil, []}, {Phil, []} ] Supervisor.init(children, strategy: :one_for_one) end end 282

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= [ {Phil, []}, {Phil, []}, {Phil, ["arg"]} ] Supervisor.init(children, strategy: :one_for_one) end end 286

= [ {Phil, []}, {Phil, []}, {Phil, ["arg"]} ] Supervisor.init(children, strategy: :one_for_all) end end 287

@bitcapulet defmodule AdmiralRavi do use Supervisor def init(_args) do children
= [ {CaptJoan, []}, {CaptJoan, []}, {CaptJoan, []} ] Supervisor.init(children, strategy: :one_for_one) end end 288

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@bitcapulet #PID<0.96.0> <0.194.0> 304

@bitcapulet305 send(pid, "hello") GenServer.cast(:phil, "a present with your name on
it")

@bitcapulet ◍ timeouts ◍ linking processes ◌ monitoring ◌ trapping
exits ◍ error handling Other benefits 306

@bitcapulet defmodule AdmiralRavi do use Supervisor def init(_args) do children
= [ {CaptJoan, []}, {CaptJoan, []}, {CaptJoan, []} ] Supervisor.init(children, strategy: :one_for_one) end end 307

@bitcapulet %{} ME WANT MORE BREAK! 308

@bitcapulet

@bitcapulet Function Pipeline State complexity clearly 314

@bitcapulet def fav_capt(:kirk) do {:error, "Are you kidding me?"} end
def fav_capt(:picard) do {:ok, "You chose wisely."} end 315

@bitcapulet capt = :picard {:ok, message} = fav_capt(capt) IO.puts(message) 316

@bitcapulet capt = :kirk {:ok, message} = fav_capt(capt) IO.puts(message) **
(MatchError) no match of right hand side value: {:error, "Are you kidding me?"} 317

@bitcapulet capt = :kirk case fav_capt(capt) {:ok, msg} -> msg
{:error, msg} -> Log.error("oops") end 318

{:error, _msg} -> Log.error("oops") end 319

{:error, _msg} -> Log.error("oops") {_, _msg} -> Log.error("What?!") end 320

{:error, _msg} -> Log.error("oops") {_, _msg} -> Log.error("What?!") _ -> Log.error("Oh dear.") end 321

@bitcapulet case fav_capt(capt) {:ok, msg} -> Log.info("That went well.") msg
{:error, _msg} -> Log.error("oops") {_, _msg} -> Log.error("What?!") _ -> Log.error("Oh dear.") end 322

@bitcapulet def respond({:ok, msg}) do Log.info("That went well.") msg end
def respond({:error, _msg}) do Log.error("oops") end 323

@bitcapulet respond(fav_capt(capt)) 324

@bitcapulet respond(fav_capt(capt)) capt |> fav_capt() |> respond() 325

@bitcapulet326

@bitcapulet capt |> fav_capt() |> respond() 327

@bitcapulet capt.fav_capt().respond() // This is constrained. 328

@bitcapulet capt |> fav_capt() |> respond() 329

@bitcapulet capt |> 330

@bitcapulet capt |> beam_to_planet() 331

@bitcapulet capt |> beam_to_planet() |> meet_aliens() 332

@bitcapulet capt |> beam_to_planet() |> meet_aliens() |> romance?() 333

@bitcapulet capt |> beam_to_planet() |> meet_aliens() |> romance?() |> case
do {:ok, details} -> log(details) :error -> kill_off_extra() end 334

@bitcapulet [1, 2, 3] 337

@bitcapulet [1, 2, 3] |> Enum.map(fn i -> i +
1 end) # [2, 3, 4] 338

@bitcapulet [1, 2, 3] |> Enum.map(fn i -> i +
1 end) |> Enum.sum() # 9 339

@bitcapulet %{} It late. Wrap it up. 340

@bitcapulet341 GenServer.start_link(CircleKeeper,[], name: :circle_keeper) GenServer.cast(:circle_keeper, {:add, %Circle{radius: 3}) total_area =
GenServer.call(:circle_keeper, :total_area)

@bitcapulet defmodule CircleKeeper do use GenServer def init(starting_circles), do: starting_circles
def handle_cast({:add, circle}, _, circles), do: {:noreply, circles ++ circle} def handle_call(:total_area, circles), do: {:reply, sum_radii(circles), circles} defp sum_radii(circles) do circles |> Enum.map(fn c -> Circle.area(c.radius) end) |> Enum.sum() end end 342

@bitcapulet {} 343

@bitcapulet %{} 344

@bitcapulet %{} 345

@bitcapulet %{} 346

@bitcapulet %{} Me here to say something inspiring to end
talk. 347

@bitcapulet %{} Language not really most important thing. 348

@bitcapulet %{} It matter you do job. 349

@bitcapulet %{} It matter you do job. And you happy
with job you do. 350

@bitcapulet %{} It also matter you make lots of money.
351

@bitcapulet %{} This language not make more money. 352

@bitcapulet %{} This language not make more money. But maybe
make more happy. 353

@bitcapulet %{} Adrian happy. 354

@bitcapulet %{} Adrian happy. He crazy. 355

@bitcapulet %{} Adrian happy. He crazy. But he happy. 356

@bitcapulet %{} He right about Elixir. It great. 357

@bitcapulet %{} Me hope you friends try it out. 358

@bitcapulet %{} 359

@bitcapulet %{} You know how you thank me. 360

@bitcapulet %{ } 361

@bitcapulet %{0} 362

@bitcapulet %{} 363

@bitcapulet %{*} 364

@bitcapulet %{} 365

@bitcapulet %{.} 366

@bitcapulet %{} 367

@bitcapulet %{} Bye! 368

@bitcapulet %{} 369

@bitcapulet %{} 370

@bitcapulet %{} 371

@bitcapulet %{} 372

@bitcapulet %{} 373

@bitcapulet %{} 374

@bitcapulet375

@bitcapulet Pinball Elixir Presentation template by SlidesCarnival 376 Adrian P.
Dunston @bitcapulet adrian@bitcapulet.com joinpapa.com

Pinball Elixir

Pinball Elixir

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