Arrayの追加、挿入、削除

ArrayAddDeleteOtherSample.swift

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)    
        //[]
    }
}