Kotlin - collections - Get Organized - MutableList, functions(add, contsins, removeAt, indexOf)

Head First Kotlin
A Brain-Friendly Guide
楽天ブックス(Kobo) 紀伊國屋書店(Kinoppy)

開発環境

• macOS Mojave - Apple (OS)
• Windows 10 Pro (OS)
• IntelliJ IDEA CE(Community Edition) (IDE(統合開発環境))
• Kotlin (プログラミング言語)

Head First Kotlin: A Brain-Friendly Guide (Dawn Griffiths(著)、David Griffiths(著)、O'Reilly Media)のChapter 9(collections - Get Organized)、Code Magnets(261)の解答を求めてみる。

コード

fun main() {
    var a: MutableList<String> = mutableListOf()
    a.add(0, "Zero")
    a.add(1, "Two")
    a.add(2, "Four")
    a.add(3, "Six")
    println(a)

    if (a.contains("Zero")) a.add("Eight")
    a.removeAt(0)
    println(a)

    if (a.indexOf("Four") != 4) a.add("Ten")
    println(a)

    println(a)
}

入出力結果

[Zero, Two, Four, Six]
[Two, Four, Six, Eight]
[Two, Four, Six, Eight, Ten]
[Two, Four, Six, Eight, Ten]

Process finished with exit code 0