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Kotlin KoansでKotlin入門 第1回:Simple Functions

Last updated at Posted at 2022-03-05

はじめに

公式の問題集「Kotlin Koans」を解きながらKotlinを学習します。

問題

Simple Functions

文字列「OK」を返すようにコードを変更してください。

fun start(): String = TODO()

解答例

TODO()を"OK"に書き換えてRUNボタンを押すとコードが実行されます。

fun start(): String = "OK"

ポイント

関数の定義に戻り値を式で指定できるようです。

戻り値の型も省略できました。

fun start() = "OK"

普通に書くとこんな感じだと思います。

fun start(): String {
    return "OK"
}
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