#Swift4.2
It's a Swift array. This section describes the creation and calling of arrays.
#Swift3の記事はこちら
Array
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| // 配列の宣言, 空配列を作成 | |
| var languages = [String]() | |
| let languages2: [String] = [] | |
| let languages3: Array<String> = [] | |
| // 代入 | |
| languages = ["Ruby","C","Swift","Python","Swift"] | |
| // 繰り返しで出力 | |
| for language in languages { | |
| print("\(language) ") | |
| // Ruby | |
| // C | |
| // Swift | |
| // Python | |
| // Swift | |
| } | |
| // インデックス付きで繰り返しで出力 | |
| for (index, language) in languages.enumerated() { | |
| print(index, language) | |
| // 0 Ruby | |
| // 1 C | |
| // 2 Swift | |
| // 3 Python | |
| // 4 Swift | |
| } | |
| // 二番目の要素にアクセス->C | |
| print("二番目の要素にアクセス->\(languages[1]) ") | |
| // 一番最後の要素にアクセス | |
| print("一番最後の要素にアクセス->\(languages.last!) ") | |
| // 一番最後の要素にアクセス->Swift | |
| // 要素数を数える | |
| print("languages配列の要素数は？->\(languages.count) ") | |
| // languages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("Pythonはlanguagesに含まれている？->\(isContein)") | |
| // Pythonはlanguagesに含まれている？->true | |
| // 要素を配列の最後に追加 | |
| 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", "Lisp", "Python", "Ruby", "Swift", "Swift"] | |
| //ソート処理：昇順 | |
| languages = languages.sorted{ $1 < $0 } | |
| print(languages) | |
| // ["Swift", "Swift", "Ruby", "Python", "Lisp", "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 | |
| print(languages) | |
| // ["Swift", "Swift", "Ruby", "Python", "Lisp", "JavaScript", "Java", "C"] | |
| languages.remove(at: 0) | |
| print(languages) | |
| // ["Swift", "Ruby", "Python", "Lisp", "JavaScript", "Java", "C"] | |
| // 最後の要素を削除 | |
| print(languages) | |
| // ["Swift", "Ruby", "Python", "Lisp", "JavaScript", "Java", "C"] | |
| languages.removeLast() | |
| print(languages) | |
| // ["Swift", "Ruby", "Python", "Lisp", "JavaScript", "Java"] | |
| // 全部削除 | |
| languages.removeAll() | |
| print(languages) | |
| // [] |