diff options
Diffstat (limited to 'index.html')
| -rw-r--r-- | index.html | 342 |
1 files changed, 342 insertions, 0 deletions
diff --git a/index.html b/index.html new file mode 100644 index 0000000..8a3701a --- /dev/null +++ b/index.html @@ -0,0 +1,342 @@ +<!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>reveal.js</title> + + <link rel="stylesheet" href="dist/reset.css" /> + <link rel="stylesheet" href="dist/reveal.css" /> + <link rel="stylesheet" href="dist/theme/blood.css" id="theme" /> + + <!-- Theme used for syntax highlighted code --> + <link + rel="stylesheet" + href="plugin/highlight/monokai.css" + id="highlight-theme" + /> + </head> + <body> + <div class="reveal"> + <div class="slides"> + <section> + <h2>Call by value<br />vs.<br />Call by reference</h2> + <small>Marvin Borner</small> + </section> + + <section> + <h2>Call by value</h2> + <p class="fragment">Der Standard in den meisten Sprachen</p> + <pre class="fragment"> + <code class="c# hljs cs" data-trim data-line-numbers="1-11|8|1-4,9|10"><script type="text/template"> + private static void ErhoeheZahl(int zahl) + { + zahl += 42; + } + + static void Main(string[] args) + { + int zahl = 0; + ErhoeheZahl(zahl); + Console.WriteLine(zahl.ToString()); + }</script></code></pre> + <small><code class="fragment">[C#-Console] 0</code></small> + </section> + + <section> + <h2>Call by reference</h2> + <p class="fragment">Wird meist bewusst verwendet</p> + <p class="fragment"> + Kann in C# mit dem + <code style="color: #ffff55">ref</code> keyword + umgesetzt werden + </p> + <pre class="fragment"> + <code class="c# hljs cs" data-trim data-line-numbers="1-11|8|1-4,9|10"><script type="text/template"> + private static void ErhoeheZahl(ref int zahl) + { + zahl += 42; + } + + static void Main(string[] args) + { + int zahl = 0; + ErhoeheZahl(ref zahl); + Console.WriteLine(zahl.ToString()); + }</script></code></pre> + <small><code class="fragment">[C#-Console] 42</code></small> + </section> + + <section> + <h2>C# Besonderheiten</h2> + + <section> + <pre class="fragment"> + <code class="c# hljs cs" data-trim data-line-numbers="1-12|9|1-5,10|11"><script type="text/template"> + private static void FuegeHinzu(List<int> liste) + { + liste.Add(4); + liste.Add(5); + } + + static void Main(string[] args) + { + List<int> liste = new List<int>() { 1, 2, 3 }; + FuegeHinzu(liste); + Console.WriteLine(liste.Count.ToString()); + }</script></code> + </pre> + <small + ><code class="fragment">[C#-Console] 5</code></small + > + </section> + + <section> + <pre> + <code class="c# hljs cs" data-trim data-line-numbers="1-12|9|1-5,10|11"><script type="text/template"> + private static void UeberschreibeListe(List<int> liste) + { + liste = new List<int>(); + liste.Add(42); + } + + static void Main(string[] args) + { + List<int> liste = new List<int>() { 1, 2, 3 }; + FuegeHinzu(liste); + Console.WriteLine(liste.Count.ToString()); + }</script></code> + </pre> + <small + ><code class="fragment">[C#-Console] 3</code></small + > + </section> + + <section> + <pre> + <code class="c# hljs cs" data-trim data-line-numbers="1-12|9|1-5,10|11"><script type="text/template"> + private static void UeberschreibeListe(ref List<int> liste) + { + liste = new List<int>(); + liste.Add(42); + } + + static void Main(string[] args) + { + List<int> liste = new List<int>() { 1, 2, 3 }; + FuegeHinzu(ref liste); + Console.WriteLine(liste.Count.ToString()); + }</script></code> + </pre> + <small + ><code class="fragment">[C#-Console] 1</code></small + > + </section> + + <section> + <pre> + <code class="c# hljs cs" data-trim data-line-numbers="1-11|8|1-4,9|10"><script type="text/template"> + private static void BearbeiteFeld(int[] felder) + { + felder[0] = 42; + } + + static void Main(string[] args) + { + int[] felder = new int[] { 1, 2, 3 }; + BearbeiteFeld(felder); + Console.WriteLine(felder[0].ToString()); + }</script></code> + </pre> + <small + ><code class="fragment" + >[C#-Console] 42</code + ></small + > + </section> + + <section> + <pre> + <code class="c# hljs cs" data-trim data-line-numbers="1-12|9|1-5,10|11"><script type="text/template"> + private static void UeberschreibeFelder(int[] felder) + { + felder = new int[] { 4, 5, 6 }; + felder[0] = 42; + } + + static void Main(string[] args) + { + int[] felder = new int[] { 1, 2, 3 }; + UeberschreibeFelder(felder); + Console.WriteLine(felder[0].ToString()); + }</script></code> + </pre> + <small + ><code class="fragment">[C#-Console] 1</code></small + > + </section> + + <section> + <pre> + <code class="c# hljs cs" data-trim data-line-numbers="1-11|8|1-4,9|10"><script type="text/template"> + private static void UeberschreibeFelder(ref int[] felder) + { + felder = new int[] { 4, 5, 6 }; + } + + static void Main(string[] args) + { + int[] felder = new int[] { 1, 2, 3 }; + UeberschreibeFelder(ref felder); + Console.WriteLine(felder[0].ToString()); + }</script></code> + </pre> + <small + ><code class="fragment">[C#-Console] 4</code></small + > + </section> + </section> + + <section> + <section> + <h2>Vorteile von call by reference</h2> + <ul> + <li class="fragment"> + Muss nicht extra kopiert werden (weniger + Overhead) + </li> + <ul> + <li + style="list-style-type: none" + class="fragment" + > + → schneller + </li> + </ul> + <li class="fragment"> + Eine Funktion kann mehrere Rückgabewerte + besitzen + </li> + </ul> + </section> + + <section> + <h2>Nachteile von call by reference</h2> + <ul> + <li class="fragment"> + Teilweise nicht sehr lesbar/verständlich + </li> + <li class="fragment"> + Probleme mit Garbage Collectors und + Multi-Threading + </li> + </ul> + </section> + </section> + + <section> + <h2>Mehrere Rückgabewerte</h2> + <pre> + <code class="c# hljs cs" data-trim data-line-numbers="1-13|10|1-6,11|12"><script type="text/template"> + private static void Rueckgabe(ref int a, ref int b, ref int c) + { + a = 1; + b = 2; + c = 3; + } + + static void Main(string[] args) + { + int a = 0, b = 0, c = 0; + Rueckgabe(ref a, ref b, ref c); + Console.WriteLine(a + ", " + b + ", " + c); + }</script></code> + </pre> + <small + ><code class="fragment" + >[C#-Console] 1, 2, 3</code + ></small + > + </section> + + <section> + <h2>Andere Sprachen</h2> + <section> + <h3>C</h3> + <pre class="fragment"> + <code class="c hljs" data-trim data-line-numbers="1-11|8|1-4,9|10"><script type="text/template"> + static void bearbeite_zeiger(int *zeiger) + { + *zeiger = 42; + } + + void main(int argc, char **argv) + { + int zahl = 0; + bearbeite_zeiger(&zahl); + printf("%d\n", zahl); + }</script></code> + </pre> + <small + ><code class="fragment">[C-Console] 42</code></small + > + </section> + + <section> + <h3>JavaScript</h3> + <pre> + <code class="js hljs" data-trim data-line-numbers="1-11|9|1-3,10|5-7,11"><script type="text/template"> + function ersetzen(obj) { + obj = {}; // Verändert das originale Objekt nicht + } + + function bearbeiten(obj) { + obj.key = "Aaah"; // Verändert das originale Objekt + } + + const toll = { key: "hihi" }; + ersetzen(toll); // obj.key => "hihi" + bearbeiten(toll); // obj.key => "Aaah" + </script></code> + </pre> + </section> + </section> + + <section> + <h2>Danke für ihre Aufmerksamkeit, tschüss!</h2> + </section> + </div> + </div> + + <script src="dist/reveal.js"></script> + <script src="plugin/notes/notes.js"></script> + <script src="plugin/markdown/markdown.js"></script> + <script src="plugin/highlight/highlight.js"></script> + <script> + // More info about initialization & config: + // - https://revealjs.com/initialization/ + // - https://revealjs.com/config/ + Reveal.initialize({ + controls: false, + hash: true, + + // Learn about plugins: https://revealjs.com/plugins/ + plugins: [RevealMarkdown, RevealHighlight, RevealNotes], + }); + + (() => { + document.getElementsByTagName("pre").forEach((e) => { + if (e.firstChild.nodeType == 3) e.firstChild.remove(); + }); + + document.getElementsByTagName("code").forEach((e) => { + if (e.nextSibling.nodeType == 3) e.nextSibling.remove(); + }); + })(); + </script> + </body> +</html> |