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Kotlin2.0以降の新機能

Avatar for punchdrunker punchdrunker
November 07, 2025
Programming
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28

 Kotlin2.0以降の新機能

Avatar for punchdrunker

punchdrunker

November 07, 2025
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Transcript

  1. Kotlin2.0以降の新機能 @punchdrunker

  2. 自己紹介 / @punchdrunker 最近買ってよかったもの • 新もののオリーブオイル • 下地さがし どこ太 •

    遠近両用レンズ • 見はらし世代(映画)

  3. Kotlin 2.xの新機能(大体experimental) • 2.2 ◦ context parameter ◦ guard condition

    ◦ nested type alias ◦ data-flow-based exhaustiveness • 2.3(これから) ◦ unused return value ◦ support Java 25

  4. オプションの設定 experimentalなものたちを有効にする引数をコンパイラに渡すと使える

  5. Demo

  6. - context parameter - 利用するメソッドが必要とする依存対象だけ用意すればよいので、巨大な repositoryとかに使うと無 駄なクラスの引き回しなどが省けそう (省メモリ) - 手軽にDIぽいことができて良さそうだが、実質引数を増やすのとほぼ同じなので、なんかすごさは

    よくわらかない - 地味に便利で助かる - guard conditions - data-flow based exhaustiveness 感想

  7. resources demoにつかったコード https://github.com/punchdrunker/hocho/blob/main/app/src/test/java/tokyo/punchdr unker/hocho/helper/KotlinNewFeatureTest.kt