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<!doctype html>
<html lang="en" prefix="og: http://ogp.me/ns#">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- SEO -->
<title>Functional Programming</title>
<meta name="description" content="Rule the world without side effects.">
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<link href="https://fonts.googleapis.com/css?family=Roboto:100,100i,300,300i,400,400i,700,700i%7CMaitree:200,300,400,600,700&subset=latin-ext"
rel="stylesheet">
<!-- CSS WebSlides -->
<link rel="stylesheet" type='text/css' media='all' href="static/css/webslides.css">
<!-- Optional - CSS SVG Icons (Font Awesome) -->
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<meta name="mobile-web-app-capable" content="yes">
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</head>
<body>
<header role="banner">
<nav role="navigation">
<p class="logo"><a href="index.html" title="Functional Programming">Functional Programming</a></p>
</nav>
</header>
<main role="main">
<article id="webslides" class="vertical">
<!-- Quick Guide
- Each parent <section> in the <article id="webslides"> element is an individual slide.
- Vertical sliding = <article id="webslides" class="vertical">
- <div class="wrap"> = container 90% / <div class="wrap size-50"> = 45%;
-->
<section class="slide-top">
<span class="background" style="background-image:url('static/images/background.jpg')"></span>
<!--.wrap = container (width: 90%) -->
<div class="wrap aligncenter slide-top">
<h1 class="text-landing"><strong>Functional Programming</strong></h1>
<p class="text-intro">Rule the world without side effects.</p>
</div>
<!-- .end .wrap -->
</section>
<section>
<div class="card-40">
<div class="content-center">
<figure>
<img src="./static/images/horse.png" alt="horse">
<figcaption>
<a href="https://blog.toggl.com/build-horse-programming/">Source</a>
</figcaption>
</figure>
</div>
</div>
<!-- .end .wrap -->
</section>
<section>
<div class="wrap size-50 aligncenter">
<h2>Objektorientierung</h2>
<h3>Ein Angriff</h3>
<blockquote>
<p>
"The problem with object-oriented languages is they’ve got all this implicit environment that they
carry
around with them. You wanted a banana but what you got was a gorilla holding the banana and the entire
jungle."
</p>
<cite>
Joe Armstrong, co-inventor of Erlang
</cite>
</blockquote>
</div>
</section>
<section class="slide">
<div class="wrap size-50">
<ul class="work">
<li class="work-label">
<p class="work-work">Object oriented</p>
<p class="work-client">Functional</p>
</li>
<li>
<p class="work-work">Single Responsibility Principle</p>
<p class="work-client">Functions</p>
</li>
<li>
<p class="work-work">Open/Closed Principle</p>
<p class="work-client"></p>
</li>
<li>
<p class="work-work">Dependency Inversion Principle</p>
<p class="work-client"></p>
</li>
<li>
<p class="work-work">Interface Segregation Principle</p>
<p class="work-client"></p>
</li>
<li>
<p class="work-work">Factory pattern</p>
<p class="work-client"></p>
</li>
<li>
<p class="work-work">Strategy pattern</p>
<p class="work-client"></p>
</li>
<li>
<p class="work-work">Decorator pattern</p>
<p class="work-client"></p>
</li>
<li>
<p class="work-work">Visitor pattern</p>
<p class="work-client"></p>
</li>
</ul>
</div>
</section>
<section class="slide">
<div class="wrap size-50">
<ul class="work">
<li class="work-label">
<p class="work-work">Object oriented</p>
<p class="work-client">Functional</p>
</li>
<li>
<p class="work-work">Single Responsibility Principle</p>
<p class="work-client">Functions</p>
</li>
<li>
<p class="work-work">Open/Closed Principle</p>
<p class="work-client">Functions</p>
</li>
<li>
<p class="work-work">Dependency Inversion Principle</p>
<p class="work-client"></p>
</li>
<li>
<p class="work-work">Interface Segregation Principle</p>
<p class="work-client"></p>
</li>
<li>
<p class="work-work">Factory pattern</p>
<p class="work-client"></p>
</li>
<li>
<p class="work-work">Strategy pattern</p>
<p class="work-client"></p>
</li>
<li>
<p class="work-work">Decorator pattern</p>
<p class="work-client"></p>
</li>
<li>
<p class="work-work">Visitor pattern</p>
<p class="work-client"></p>
</li>
</ul>
</div>
</section>
<section class="slide">
<div class="wrap size-50">
<ul class="work">
<li class="work-label">
<p class="work-work">Object oriented</p>
<p class="work-client">Functional</p>
</li>
<li>
<p class="work-work">Single Responsibility Principle</p>
<p class="work-client">Functions</p>
</li>
<li>
<p class="work-work">Open/Closed Principle</p>
<p class="work-client">Functions</p>
</li>
<li>
<p class="work-work">Dependency Inversion Principle</p>
<p class="work-client">Functions</p>
</li>
<li>
<p class="work-work">Interface Segregation Principle</p>
<p class="work-client"></p>
</li>
<li>
<p class="work-work">Factory pattern</p>
<p class="work-client"></p>
</li>
<li>
<p class="work-work">Strategy pattern</p>
<p class="work-client"></p>
</li>
<li>
<p class="work-work">Decorator pattern</p>
<p class="work-client"></p>
</li>
<li>
<p class="work-work">Visitor pattern</p>
<p class="work-client"></p>
</li>
</ul>
</div>
</section>
<section class="slide">
<div class="wrap size-50">
<ul class="work">
<li class="work-label">
<p class="work-work">Object oriented</p>
<p class="work-client">Functional</p>
</li>
<li>
<p class="work-work">Single Responsibility Principle</p>
<p class="work-client">Functions</p>
</li>
<li>
<p class="work-work">Open/Closed Principle</p>
<p class="work-client">Functions</p>
</li>
<li>
<p class="work-work">Dependency Inversion Principle</p>
<p class="work-client">Functions</p>
</li>
<li>
<p class="work-work">Interface Segregation Principle</p>
<p class="work-client">Functions</p>
</li>
<li>
<p class="work-work">Factory pattern</p>
<p class="work-client"></p>
</li>
<li>
<p class="work-work">Strategy pattern</p>
<p class="work-client"></p>
</li>
<li>
<p class="work-work">Decorator pattern</p>
<p class="work-client"></p>
</li>
<li>
<p class="work-work">Visitor pattern</p>
<p class="work-client"></p>
</li>
</ul>
</div>
</section>
<section class="slide">
<div class="wrap size-50">
<ul class="work">
<li class="work-label">
<p class="work-work">Object oriented</p>
<p class="work-client">Functional</p>
</li>
<li>
<p class="work-work">Single Responsibility Principle</p>
<p class="work-client">Functions</p>
</li>
<li>
<p class="work-work">Open/Closed Principle</p>
<p class="work-client">Functions</p>
</li>
<li>
<p class="work-work">Dependency Inversion Principle</p>
<p class="work-client">Functions</p>
</li>
<li>
<p class="work-work">Interface Segregation Principle</p>
<p class="work-client">Functions</p>
</li>
<li>
<p class="work-work">Factory pattern</p>
<p class="work-client">Functions</p>
</li>
<li>
<p class="work-work">Strategy pattern</p>
<p class="work-client">Functions</p>
</li>
<li>
<p class="work-work">Decorator pattern</p>
<p class="work-client">Functions</p>
</li>
<li>
<p class="work-work">Visitor pattern</p>
<p class="work-client">Functions</p>
</li>
</ul>
</div>
</section>
<section>
<div class="wrap size-50 aligncenter">
<div class="content-left">
<img src="static/images/smalltalk.jpg">
<figcaption>
<a href="https://medium.com/smalltalk-talk/make-smalltalk-great-again-images-7cb21cd10623">Source</a>
</figcaption>
</div>
<div class="content-left">
<h2>Objektorientierung</h2>
<h3>Eine Verteidigung</h3>
<blockquote>
<p>
"I made up the term object-oriented, and I can tell you I did not have C++ in mind."
</p>
<cite>
Alan Kay, co-inventor of Smalltalk
</cite>
</blockquote>
</div>
</div>
</section>
<section>
<div class="wrap size-50 aligncenter">
<h2>
Functional Programming - neues Konzept?
</h2>
</div>
</section>
<section>
<div class="wrap">
<h2 class="aligncenter">FP - neues Konzept?</h2>
<div class="content-left">
<h3>Talks</h3>
<ul class="flexblock specs">
<li>
<div>
<h2>Purifying Typescript</h2>
</div>
</li>
<li>
<div>
<h2>Functional programming in Rust</h2>
</div>
</li>
<li>
<div>
<h2>Immutable data structures for functional JS</h2>
</div>
</li>
</ul>
</div>
<div class="content-left">
<div class="vertical-align"></div>
<video autoplay loop>
<source src="static/videos/sharknado.mp4" type="video/mp4">
</video>
</div>
</div>
</section>
<section>
<div class="wrap height-200">
<div class="content-left">
<figure>
<img src="./static/images/programming-evolution-perceived.png" alt="history perceived">
</figure>
<!-- end figure-->
<!-- end .flex-content-->
</div>
<div class="content-left">
<h2>
Entwicklung der Programmiersprachen
</h2>
<h3>Gefühlt</h3>
</div>
<!-- end .card-60-->
</div>
<!-- .end .wrap -->
</section>
<section>
<div class="wrap height-200">
<div class="content-left">
<h2>
Entwicklung der Programmiersprachen
</h2>
<h3>Tatsächlich</h3>
</div>
<div class="content-left">
<figure>
<img src="./static/images/programming-evolution-actual.png" alt="history perceived">
</figure>
</div>
</div>
</section>
<section class="slide">
<div class="wrap">
<div class="content-left">
<h2>
Lisp machine
</h2>
<a href="https://de.wikipedia.org/wiki/Lisp-Maschine">Source</a>
</div>
</div>
<span class="background-right" style="background-image:url('./static/images/lisp_machine.jpg')"></span>
<!-- .end .wrap -->
</section>
<section class="slide">
<div class="wrap">
<div class="content-left">
<h2>
Moore's Law
</h2>
<a href="https://www.extremetech.com/extreme/203490-moores-law-is-dead-long-live-moores-law">Source</a>
</div>
</div>
<span class="background-right" style="background-image:url('./static/images/moores_law.jpg')"></span>
<!-- .end .wrap -->
</section>
<section class="slide">
<div class="wrap">
<div class="content-left">
<h2>
Multithreading
</h2>
<a href="https://smyck.net/2012/04/22/why-erlang/">Source</a>
</div>
<div class="content-left">
<img src="./static/images/concurrent.jpg">
</div>
</div>
<!-- .end .wrap -->
</section>
<section class="slide">
<div class="wrap">
<div class="content-left">
<h2>
Multithreading
</h2>
<a href="https://phoenixframework.org/blog/the-road-to-2-million-websocket-connections">Source</a>
</div>
</div>
<span class="background-right" style="background-image:url('./static/images/elixir.png')"></span>
<!-- .end .wrap -->
</section>
<section>
<div class="wrap aligncenter">
<h2>
Functional programming
</h2>
<div class=grid ms">
<div class=column>
<ul class="flexblock specs">
<li>Monads</li>
<li>Type classes</li>
<li>Endofunctors</li>
<li>Referential transparency</li>
</ul>
</div>
<div class=column>
<ul class="flexblock specs">
<li>Algebraic data types</li>
<li>Arity</li>
<li>Higher-order functions</li>
<li>Foldable</li>
</ul>
</div>
<div class=column>
<ul class="flexblock specs">
<li>Currying</li>
<li>Closure</li>
<li>Purity</li>
<li>Endomorphism</li>
</ul>
</div>
</div>
</div>
</section>
<section>
<div class="wrap aligncenter">
<h2>
Definition
</h2>
</div>
</section>
<section>
<!--.wrap = container (width: 90%) -->
<div class="wrap">
<div class="aligncenter">
<h2>FP - ein alter Vertrauter</h2>
</div>
<ul class="flexblock">
<li>
<pre><code class="javascript">
for (i = 0; i < array.length; i++) {
pushToStructure(array[i]);
}
</code></pre>
</li>
<li>
<pre><code class="javascript">
array.forEach(element => pushToStructure(element));
</code></pre>
</li>
</ul>
<ul class="flexblock">
<li><pre><code class="javascript">
for (i = 0; i < array.length; i++) {
newArray.push(array[i] * array[i] * array[i]);
}
</code></pre></li>
<li><pre><code class="javascript">
const numbers = [1, 2, 3, 4]
const cubedNumbers = numbers.map(element => number * number * number);
</code></pre></li>
</ul>
<ul class="flexblock">
<li><pre><code class="javascript">var newArray = [];
for (i = 0; i < array.length; i++) {
if (array[i] < 10) {
newArray.push(array[i]);
}
}</code></pre></li>
<li><pre><code class="javascript">
const newArray = array.filter(element => element < 10);
</code></pre></li>
</ul>
</div>
<!-- .end .grid -->
</div>
<!-- .end .wrap -->
</section>
<section>
<div class="wrap size-50 aligncenter">
<h2>
Definition 1
</h2>
<blockquote>
<p>
"Eine Monade ist ein Monoid in der Kategorie der Endofunktoren"
</p>
<cite>
Extremly clever random guy
</cite>
</blockquote>
</div>
</section>
<section>
<div class="wrap aligncenter">
<video autoplay loop>
<source src="static/videos/what.mp4" type="video/mp4">
</video>
</div>
</section>
<section>
<div class="wrap size-50 aligncenter">
<h2>
Definition 2
</h2>
<div class="content-left">
<div class="card-50 bg-white">
<h3>y = f(x)</h3>
</div>
</div>
<div class="content-left">
<figure>
<img src="https://upload.wikimedia.org/wikipedia/commons/9/95/Graph_describing_a_linear_function.svg" alt="function">
</figure>
</div>
</div>
</section>
<section>
<div class="wrap size-50 aligncenter">
<h2>Definition 3</h2>
<p class="description">Keine Seiteneffekte</p>
<img src="static/images/pipeline.png">
</div>
</section>
<section>
<div class="wrap size-50 aligncenter">
<h2>
Definition 3
</h2>
<img src="static/images/pipeline_no_calls.png">
</div>
</section>
<section>
<div class="wrap size-50 aligncenter">
<h2>
Definition 3
</h2>
<img src="static/images/pipeline_no_database.png">
</div>
</section>
<section>
<!--.wrap = container (width: 90%) -->
<div class="wrap">
<div class="column aligncenter size-50">
<h2>Definition 3</h2>
<h3>Denkweise FP</h3>
<ul class="description">
<li>Data</li>
<li>Calculations</li>
<li>Actions</li>
</ul>
</div>
</div>
</section>
<section class="slide">
<!--.wrap = container (width: 90%) -->
<div class="wrap">
<div class="grid vertical-align">
<div class="column">
<h2>Denkweise FP</h2>
<p>Data</p>
</div>
<!-- .end .column -->
<div class="column">
<pre><code class="javascript">
const docNumber = 11;
const yell = 'Alons-y';
const doctors = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13];
const recentDoctor = {
actor: 'Jodie Whittaker',
number: 13,
gender: 'Time lord'
level: 9001
};
</code></pre>
</div>
</div>
</div>
</section>
<section class="slide">
<!--.wrap = container (width: 90%) -->
<div class="wrap">
<div class="grid vertical-align">
<div class="column">
<h2>Denkweise FP</h2>
<p>Calculations</p>
<p><i>Data is Code - Code is Data</i></p>
</div>
<!-- .end .column -->
<div class="column">
<pre><code class="typescript">
cube(x: number): number {
return x * x * x;
}
isValidEmail(email: string): boolean {
const mailRegex = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
return mailRegex.test(email);
}
</code></pre>
</div>
</div>
</div>
</section>
<section class="slide">
<!--.wrap = container (width: 90%) -->
<div class="wrap">
<div class="grid vertical-align">
<div class="column">
<h2>Denkweise FP</h2>
<p>Actions</p>
</div>
<!-- .end .column -->
<div class="column">
<pre><code class="typescript">
sendMail(recipient: User): void {
[...]
}
getUser(id: userID): User {
return db.getUserById(id);
}
</code></pre>
</div>
</div>
</div>
</section>
<section class="slide">
<!--.wrap = container (width: 90%) -->
<div class="wrap">
<div class="grid vertical-align">
<div class="column">
<h2>Denkweise FP</h2>
<p>Data - Calculations - Actions</p>
</div>
<!-- .end .column -->
<div class="column">
<img src="static/images/data-calculations-actions.png" alt="data-calculations-actions">
</div>
</div>
</div>
</section>
<section class="slide">
<!--.wrap = container (width: 90%) -->
<div class="wrap">
<div class="grid vertical-align">
<div class="column">
<h2>Definition - Eigenschaften</h2>
<p>First-class functions</p>
</div>
<!-- .end .column -->
<div class="column">
<pre><code class="javascript">
const number = 4;
const addOne = function (number) {
return number + 1;
}
const addTwo = function (number) {
return number + 2;
}
calculateSum(number, addOne, addTwo);</code></pre>
</div>
<!-- .end .column -->
</div>
<!-- .end .grid -->
</div>
<!-- .end .wrap -->
</section>
<section>
<!--.wrap = container (width: 90%) -->
<div class="wrap">
<div class="grid vertical-align">
<div class="column">
<h2>Definition - Eigenschaften</h2>
<p>Immutability</p>
</div>
<!-- .end .column -->
<div class="column">
<div class="row">
<pre><code class="javascript">
function doSomething(param) {
param = param + 1; <--- NOT ALLOWED!
}
function doSomethingElse(obj) {
obj.count = 5; <--- NOT ALLOWED!
obj['anotherProp'] = [3, 2, 3]; <--- NOT ALLOWED!
}
</code></pre>
</div>
<div class="column">
<pre><code class="javascript">
function doSomething(param) {
const newParam = param + 1;
}
function doSomethingElse(obj) {
const newObject = Object.assign({}, obj, { count: 5 });
const newObject2 = Object.assign({}, obj, { anotherProp: [3, 2, 3] });
}
</code></pre></div>
</div>
</div>
</div>
</section>
<section>
<!--.wrap = container (width: 90%) -->
<div class="wrap">
<div class="grid vertical-align">
<div class="column">
<h2>Definition - Eigenschaften</h2>
<p>Stateless</p>
</div>
<!-- .end .column -->
<div class="column">
<pre><code class="javascript">
function doNotModifyInput(param) {
global.myProperty = 5; <-- Don't access global state
}
</code></pre>
</div>
<!-- .end .column -->
</div>
<!-- .end .grid -->
</div>
<!-- .end .wrap -->
</section>
<section>
<!--.wrap = container (width: 90%) -->
<div class="wrap">
<div class="grid vertical-align">
<div class="column">
<h3>Object-Oriented</h3>
</div>
<!-- .end .column -->
<div class="column">
<pre><code>
class PasswordTester {
private password: Password;
private email: Email;
constructor(password: Password, email: Email) {
this.password = password;
this.email = email;
}
public setPassword(password: Password) {
this.password = password;
}
public setEmail(email: Email) {
this.email = email;
}
public isInvalidPassword(): boolean {
return !this.password.contains(this.email);
}
}
</code></pre>
</div>
<!-- .end .column -->
</div>
<!-- .end .grid -->
</div>
<!-- .end .wrap -->
</section>
<section>
<!--.wrap = container (width: 90%) -->
<div class="wrap">
<div class="grid vertical-align">
<!-- .end .column -->
<div class="column">
<pre><code class="javascript">
isInvalidPassword(password: Password, email: Email): boolean {
return !password.contains(email);
}
</code></pre>
</div>
<div class="column">
<h2>Functional</h2>
</div>
</div>
</div>
</section>
<section>
<div class="wrap aligncenter size-30">
<h2>
Fazit
</h2>
<ul class="description">
<li>Einfacher Code: Input --> Output</li>
<li>Einfach zu debuggen</li>
<li>Einfach zu testen (Kein Mocking notwendig)</li>
</ul>
</div>
<!-- .end .wrap -->
</section>
<section class="slide-top">
<span class="background" style="background-image:url('static/images/horrible_code.png')"></span>
<!--.wrap = container (width: 90%) -->
<div class="wrap aligncenter slide-top bg-black size-20">
<h2 class="text-white">Horrible code</h1>
</div>
<!-- .end .wrap -->
</section>
<section>
<div class="wrap">
<div class="content-left">
<figure>
<img src="./static/images/unstructured-code.png" alt="unstructured code">
</figure>
</div>
<div class="content-left">
<h2>
Guter Code?
</h2>
<ul class="description">
<li>Keine definierten Einstiegspunkte</li>
<li>Schwer zu debuggen</li>
</ul>
</div>
<!-- end .card-60-->
</div>
<!-- .end .wrap -->
</section>
<section>
<div class="wrap">
<div class="content-left">
<video autoplay loop>
<source src="static/videos/goto.mp4" type="video/mp4">
</video>
</div>
<div class="content-left">
<h2>Structured Programming</h2>
</div>
<div class="content-left">
<blockquote>
<p>
"Go To Statement Considered Harmful"
</p>
<cite>
Edsger W. Dijkstra (1968)
</cite>
</blockquote>
</div>
<!-- end .card-60-->
</div>
<!-- .end .wrap -->
</section>
<section>
<div class="wrap size-50 aligncenter">
<blockquote>
<p>
"Aber Pascal, wenn FP so cool ist, warum ist dann die ganze Welt nicht funktional?"
</p>
<cite>
Gerade jeder im Raum
</cite>
</blockquote>
</div>
</section>
<section class="aligncenter">
<div class="wrap">
<div class="text-serif">
<video autoplay loop>
<source src="static/videos/tardis.mp4" type="video/mp4">
</video>
</div>
<!-- .end .content-right -->
</div>
<!-- .end .wrap -->
</section>
<section>
<div class="wrap size-30 aligncenter">
<h2>Beispiele</h2>
<h3>Compiler</h3>
<ul class="flexblock specs">
<li><strong>Haskell</strong></li>
</ul>