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02_advanced/unterricht/tag11/01_objekte.html
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93
02_advanced/unterricht/tag11/01_objekte.html
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<!doctype html>
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<html lang="de">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Object - object</title>
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<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.8/dist/css/bootstrap.min.css" rel="stylesheet" />
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</head>
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<body>
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<main>
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<div class="container py-5">
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<h1>Objekt - object</h1>
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<p>
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Der
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<a href="https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Object">Object</a>-Typ
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repräsentiert einen von JavaScript's Datentypen. Er wird verwendet, um verschiedene Schlüsselkollektionen und
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komplexere Entitäten zu speichern. Objekte können mit dem <strong>Object()</strong>-Konstruktor oder der
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Objekt-Initialisierer-Syntax erstellt werden.
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</p>
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<div class="output alert alert-secondary my-3"></div>
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</div>
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</main>
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<script>
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'use strict';
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const outputEl = document.querySelector('.output');
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const ar = [];
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const ar2 = new Array(); // oder Array()
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const str = ''; // "" | ```
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const str2 = new String(); // oder String();
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const zahl = 123;
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const zahl2 = new Number(); // oder Number();
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const fn = () => {}; // function() {}
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const fn2 = new Function(); // oder Function();
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const bool = true;
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const bool2 = new Boolean(); // oder Boolean();
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// =================
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const obj = {};
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const obj2 = new Object(); // oder Object()
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console.log(typeof str); // 'string' - Objekt vom Typ String
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console.log(typeof false); // 'boolean' - Objekt vom Typ Boolean
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console.log(typeof zahl); // 'number' - Objekt vom Typ Number
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console.log(typeof NaN); // 'number' - Objekt vom Typ Number
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console.log(typeof (() => {})); // 'function' - Objekt vom Typ Function
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console.log(typeof undefined); // undefined
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console.log(typeof ar); // 'object' vom Typ Array
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console.log(typeof null); // 'object' vom Typ Null
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console.log(typeof {}); // 'object' vom Typ Object
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// Eigenschaften können selber definiert werden.
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obj.prop = 'rot';
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console.log(obj.prop); // => 'rot'
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console.log(obj['prop']); // => 'rot'
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console.log('text'.length); // => 4
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console.log(['eins', 'zwei', 'drei'].length); // => 3
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const personObj = {
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firstName: 'John',
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lastName: 'Wick',
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age: 45,
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hobbies: ['Gassi gehen', 'Ballern'],
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lauf: () => {
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return 'Person läuft';
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},
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schiess: () => {
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console.log('pew pew');
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},
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};
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// Object.freeze(personObj);
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personObj.hairColor = 'Braun';
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console.log(personObj);
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console.log(personObj.lauf()); // => 'Person läuft'
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console.log(personObj.schiess());
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console.log(personObj.age); // => 45
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</script>
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</body>
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</html>
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