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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>Functional Programming in Python 🐍</title>
<link rel="stylesheet" href="css/reveal.css">
<link rel="stylesheet" href="css/theme/black.css">
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<link rel="stylesheet" href="lib/css/zenburn.css">
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<script>
var link = document.createElement( 'link' );
link.rel = 'stylesheet';
link.type = 'text/css';
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document.getElementsByTagName( 'head' )[0].appendChild( link );
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</head>
<body>
<div class="reveal">
<div class="slides">
<section>Functional Programming in Python 🐍</section>
<section>
<h2>About me</h2>
<p>Riccardo aka <a href="https://twitter.com/entropiae">@entropiae</a></p>
<p>Python in the streets<br>Erlang/Elixir (currently) in the sheets</p>
</section>
<section id="fragments">
<section>
<h2>Functional programming? 🤔</h2>
<p class="fragment">
(almost) every developer has its own idea about functional programming.
</p>
</section>
<section>
First-class functions
<aside class="notes">Permits to treat functions as data, passed to other functions</aside>
</section>
<section>
Higher-order functions
<aside class="notes">Functions whose accept other functions as arguments, return functions</aside>
</section>
<section>
Recursion instead of iteration
<p class="fragment">Focus on Tail Call Optimization</p>
<p class="fragment"><a href="http://neopythonic.blogspot.it/2009/04/final-words-on-tail-calls.html">(not available in Python 😥)</a>
</p>
</section>
<section>
Immutable data structures
</section>
<section>
Lazy evaluation
<pre>
<code data-trim data-noescape>len([1, 1/0, '3']) == 3</code>
</pre>
</section>
<section>
Emphasis on <b>what</b> is done, not on <s>how</s> is done
</section>
</section>
<section id="fragments">
<section>
<h2>Ok ok, functions.</h2>
</section>
<section>
(Mathematical) functions
</section>
<section>
Pure functions
<p class="fragment">No side effects</p>
<p class="fragment">Perfectly pure, almost useless</p>
<p class="fragment"><i>Practicality beats purity.</i></p>
</section>
<section>
Referential transparency
<p class="fragment">Memoization</p>
</section>
<section>
No order constraint
<p class="fragment">Full support for Multi{core, cpu, node} archs</p>
<p class="fragment">Compiler optimization</p>
</section>
</section>
<section>
<section><h2>Python as a functional programming language?</h2></section>
<section>Python is not, by design, a FP language</section>
<section>
However..
<p class="fragment">..coz everything is an object..</p>
<p class="fragment">..we have first-class functions! 🎉</p>
</section>
<section>
1994: higher-order functions were introduced in Python
</section>
<section>
map: transform a collection
<pre><code data-trim data-noescape>map(lambda x: x + 1, [1, 2, 3]) == [2, 3, 4]</code></pre>
</section>
<section>
filter: remove elements from a collection
<pre><code data-trim data-noescape>filter(lambda x: x % 2 == 0, [1, 2, 3]) == [2]</code></pre>
</section>
<section>
reduce: recursively apply an operation on a collection
<pre><code data-trim data-noescape>reduce(lambda x, y: x + y, [1, 2, 3]) == 6</code></pre>
<p class="fragment">The cornestone of higher-order functions</p>
</section>
<section>
map() and filter() could be replaced with a list comprehension
<p class="fragment"><i>There should be one - and preferably only one - obvious way to do it.</i></p>
<p class="fragment">GvR doesn't like them 😕</p>
</section>
<section>
It was proposed to remove them from Python 3
</section>
<section>
More functions were build on these building blocks
<p class="fragment">functools, itertools</p>
</section>
</section>
<section>
<section>And now for something completely different</section>
<section>
Pietro will show us some code samples ✌️
</section>
</section>
</div>
</div>
<script src="lib/js/head.min.js"></script>
<script src="js/reveal.js"></script>
<script>
// More info https://github.com/hakimel/reveal.js#configuration
Reveal.initialize({
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</body>
</html>