How to write an array
It's a Swift array. This section describes the creation and calling of arrays.
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| import UIKit | |
| class ViewController: UIViewController { | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| //配列の宣言 | |
| let languages = ["Ruby","C","Swift","Python","Swift"] | |
| //繰り返して結果を出力 | |
| for language in languages { | |
| print("\(language) ") | |
| //Ruby C Swift Python Swift と出力される | |
| } | |
| //二番目の要素にアクセス | |
| print("二番目の要素にアクセス->\(languages[1]) ") | |
| //二番目の要素にアクセス->C と出力される | |
| //一番最後の要素にアクセス | |
| print("二番目の要素にアクセス->\(languages.last) ") | |
| //一番最後の要素にアクセス->Swift と出力される | |
| //要素数を数える | |
| print("languages配列の要素数は？->\(languages.count) ") | |
| //programings配列の要素数は？->5 | |
| //配列の中にある要素が含まれているのかを調べる | |
| let isContein:Bool = languages.contains("Python") | |
| print("isConteinの中身->\(isContein)") | |
| //isConteinの中身->true | |
| //型明記(以下、INT型で宣言) | |
| var intArray:[Int] = [1,1,2,3,5,8,12,20] | |
| //配列の要素を足し算 | |
| print("\(intArray[1] + intArray[2])") | |
| //3 と出力される, 1+2 | |
| } | |
| } |
Add, Insert and Delete Arrays
I will try to add, insert and delete arrays.
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| import UIKit | |
| class ViewController: UIViewController { | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| //配列の宣言 | |
| var languages = ["Ruby","C","Swift","Python","Swift"] | |
| //要素の追加 | |
| languages.append("lisp") | |
| print(languages) | |
| //["Ruby", "C", "Swift", "Python", "Swift", "lisp"] | |
| //配列に要素を追加、先頭に挿入 | |
| languages.insert("Java", at: 0) | |
| print(languages) | |
| //["Java", "Ruby", "C", "Swift", "Python", "Swift", "lisp"] | |
| //配列に要素を追加、2番目に挿入 | |
| languages.insert("JavaScript", at: 2) | |
| print(languages) | |
| //["Java", "Ruby", "JavaScript", "C", "Swift", "Python", "Swift", "lisp"] | |
| //配列の反転 | |
| languages = languages.reversed() | |
| print(languages) //["lisp", "Swift", "Python", "Swift", "C", "JavaScript", "Ruby", "Java"] | |
| //ソート処理：降順 | |
| languages = languages.sorted{ $0 < $1 }; | |
| print(languages) | |
| //["C", "Java", "JavaScript", "Python", "Ruby", "Swift", "Swift", "lisp"] | |
| //ソート処理：昇順 | |
| languages = languages.sorted{ $1 < $0 } | |
| print(languages) | |
| //["lisp", "Swift", "Swift", "Ruby", "Python", "JavaScript", "Java", "C"] | |
| //フィルタ（最初の文字が*の場合。以下はJの場合） | |
| let filteredLanguages = languages.filter {$0.hasPrefix("J")} | |
| print(filteredLanguages) | |
| //["JavaScript", "Java"] | |
| //一番目の要素を削除 | |
| languages.remove(at: 0) | |
| print(languages) | |
| //["Swift", "Swift", "Ruby", "Python", "JavaScript", "Java", "C"] | |
| //最後の要素を削除 | |
| languages.removeLast() | |
| print(languages) | |
| //["Swift", "Swift", "Ruby", "Python", "JavaScript", "Java"] | |
| //全部削除 | |
| languages.removeAll() | |
| print(languages) | |
| //[] | |
| } | |
| } |