Initial check-in
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.gitignore
vendored
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.gitignore
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*.beam
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presentation.md
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presentation.md
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slidenumbers: true
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Erlang.
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======
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### Fault-tolerant, concurrent programming.
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---
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## A brief history of Erlang
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---
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![](https://www.ericsson.com/thinkingahead/the-networked-society-blog/wp-content/uploads/2014/09/bfW5FSr.jpg)
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^ Telefontornet in Stockholm, around 1890. Used until 1913.
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---
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![](https://3.bp.blogspot.com/-UF7W9yTUO2g/VBqw-1HNTzI/AAAAAAAAPeg/KvsMbNSAcII/s1600/6835942484_1531372d8f_b.jpg)
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^ Telephones were operated manually at Switchboards. Anyone old enough to remember? I'm certainly not.
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---
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![fit](https://russcam.github.io/fsharp-akka-talk/images/ericsson-301-AXD.png)
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^ Eventually we did that in software, and we got better at it over time. Ericsson AXD 301, first commercial Erlang switch. But lets take a step back.
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---
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## Phone switches must be ...
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Highly concurrent
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Fault-tolerant
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Distributed
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(Fast!)
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![right 150%](http://learnyousomeerlang.com/static/img/erlang-the-movie.png)
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---
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## ... and so is Erlang!
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---
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## Erlang as a whole:
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- Unique process model (actors!)
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- Built-in fault-tolerance & error handling
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- Distributed processes
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- Three parts!
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---
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## Part 1: Erlang, the language
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- Functional
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- Prolog-inspired syntax
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- Everything is immutable
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- *Extreme* pattern-matching
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---
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### Hello Joe
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```erlang
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hello_joe.
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```
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---
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### Hello Joe
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```erlang
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-module(hello1).
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-export([hello_joe/0]).
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hello_joe() ->
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hello_joe.
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```
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---
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### Hello Joe
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```erlang
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-module(hello1).
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-export([hello_joe/0]).
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hello_joe() ->
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hello_joe.
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% 1> c(hello1).
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% {ok,hello1}
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% 2> hello1:hello_joe().
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% hello_joe
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```
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---
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### Hello Joe
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```erlang
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-module(hello2).
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-export([hello/1]).
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hello(Name) ->
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io:format("Hello ~s!~n", [Name]).
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% 3> c(hello2).
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% {ok,hello2}
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% 4> hello2:hello("Joe").
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% Hello Joe!
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% ok
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```
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---
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## Drag & Drop images
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### Simply *drop an image onto the Deckset window* and the Markdown you need to display the image is automatically created and *copied to the clipboard.*
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---
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* This works with both local files and web images
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* You don’t _need_ to drag the file, you can also type the Markdown yourself if you know how
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![left,filtered](http://deckset-assets.s3-website-us-east-1.amazonaws.com/colnago1.jpg)
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5
src/hello.erl
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5
src/hello.erl
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-module(hello).
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-export([hello_joe/0]).
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hello_joe() ->
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hello_joe.
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src/hello1.erl
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5
src/hello1.erl
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-module(hello1).
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-export([hello_joe/0]).
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hello_joe() ->
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hello_joe.
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src/hello2.erl
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11
src/hello2.erl
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-module(hello2).
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-export([hello/1]).
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hello(Name) ->
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io:format("Hello ~s!~n", [Name]).
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% 3> c(hello2).
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% {ok,hello2}
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% 4> hello2:hello("Joe").
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% Hello Joe!
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% ok
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