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--- | ||
title: Anordnungen | ||
date: 2023-07-22T20:49:19+02:00 | ||
draft: false | ||
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subtitle: | ||
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weight: 10 | ||
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tags: [swift, array] | ||
--- | ||
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Ein [Anordnungen](https://docs.swift.org/swift-book/documentation/the-swift-programming-language/collectiontypes#Arrays) <_array_> ist eine geordnete Liste von Elementen. Für die Deklarierung wird das Schlüsselwort `array` genutzt. | ||
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```swift | ||
let array = ["volker", "nils"] // struct Array<Element> | ||
``` | ||
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### Definition | ||
```swift | ||
// Definition | ||
@frozen | ||
struct Array<Element> | ||
``` | ||
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### Deklaration | ||
```swift | ||
// Ein leeres Array für Strings deklarieren | ||
var a1: Array<String> = Array() | ||
var a2: Array<String> = [] | ||
var a3 = Array<String>() | ||
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var a4: [String] = Array() | ||
var a5: [String] = [] | ||
var a6 = [String]() | ||
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print(type(of: a1)) // --> Array<String> | ||
print(a1) // --> [] | ||
``` | ||
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### Initialisierung | ||
```swift | ||
// Ein leeres Array für Strings deklarieren und initialisieren (Werte zuweisen). | ||
var a1: Array<String> = Array(["volker", "nils"]) | ||
var a2: Array<String> = ["volker", "nils"] | ||
var a3 = Array<String>(["volker", "nils"]) | ||
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var a4: [String] = Array(["volker", "nils"]) | ||
var a5: [String] = ["volker", "nils"] | ||
var a6 = ["volker", "nils"] | ||
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print(type(of: a1)) // --> Array<String> | ||
print(a1) // --> ["volker", "nils"] | ||
``` | ||
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### Ausgewählte Eigenschaften und Funktionen | ||
```swift | ||
// Wichtige Eigenschaften und Methoden von Arrays | ||
var names = ["volker", "nils", "monika", "jana", "hanna"] | ||
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// .count | ||
// Die Anzahl der Elemente im Array. | ||
print( names.count ) // --> 5 | ||
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// .append() | ||
// Fügt am Ende des Arrays ein neues Element hinzu. | ||
names.append("rainer") | ||
print( names ) // --> ["volker", "nils", "monika", "jana", "hanna", "rainer"] | ||
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// Fügt die Elemente einer Sequenz am Ende des Arrays hinzu. | ||
names.append(contentsOf: ["ludwig", "anne"]) | ||
print( names ) // --> ["volker", "nils", "monika", "jana", "hanna", "rainer", "ludwig", "anne"] | ||
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// .remove() | ||
// Entfernt das Element an der angegebenen Position und gibt es zurück. | ||
print( names.remove(at: 1) ) // --> nils | ||
print(names) // --> ["volker", "monika", "jana", "hanna", "rainer", "ludwig", "anne"] | ||
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// .sort() | ||
// Sortiert die Elemente von oben nach unten. | ||
names.sort() | ||
print( names ) // --> ["anne", "hanna", "jana", "ludwig", "monika", "rainer", "volker"] | ||
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// .reverse() | ||
// Sortiert die Elemente von unten nach oben. | ||
names.reverse() | ||
print( names ) // --> ["volker", "rainer", "monika", "ludwig", "jana", "hanna", "anne"] | ||
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// .map() | ||
// Gibt ein Array zurück, das die Elemente entsprechend den Anforderungen des Closures verändert. | ||
print( names.map( { "vorname: " + $0 } ) ) // --> ["vorname: volker", "vorname: rainer", ...] | ||
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// .filter() | ||
// Gibt ein Array zurück, das Elemente entsprechend den Anforderungen des Closures enthält. | ||
print( names.filter( { $0.contains("an") } ) ) // --> ["anne", "hanna", "jana"] | ||
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// .reduce() | ||
// Gibt das Ergebnis entsprechend den Anforderungen des Closures zurück. | ||
print( names.reduce("") { $0 + $1 + " " } ) // --> volker rainer monika ludwig jana hanna anne | ||
``` | ||
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<br> | ||
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##### Links: | ||
[`doku`](https://developer.apple.com/documentation/swift/array, "Apple Dokumentation") | ||
[`buch`](https://docs.swift.org/swift-book/documentation/the-swift-programming-language/collectiontypes#Arrays, "Swift.org Buch") |