Upgrade to Pro — share decks privately, control downloads, hide ads and more …
Sign up for free

Kotlin2.0以降の新機能

Sponsored · Your Podcast. Everywhere. Effortlessly. Share. Educate. Inspire. Entertain. You do you. We'll handle the rest. →
Avatar for punchdrunker punchdrunker
November 07, 2025
Programming
71
0

 Kotlin2.0以降の新機能

Avatar for punchdrunker

punchdrunker

November 07, 2025

More Decks by punchdrunker

See All by punchdrunker
DnD in Compose
Avatar for punchdrunker punchdrunker
0
360
what's new in Material Design で気になったトピック
Avatar for punchdrunker punchdrunker
1
660
7カ国語に対応したサービスでの翻訳管理システムの改善事例
Avatar for punchdrunker punchdrunker
1
1.7k
Java Bytecode Vertical Tasting
Avatar for punchdrunker punchdrunker
2
1.6k
getting started with dark theme
Avatar for punchdrunker punchdrunker
2
1.1k
Practical Activity Transition in Android
Avatar for punchdrunker punchdrunker
0
1.3k
今時のProgress indicator / Replacing ProgressDialog with ProgressBar
Avatar for punchdrunker punchdrunker
0
760
レビュー評価4.7の秘密 / The Secret To A Better Reputation
Avatar for punchdrunker punchdrunker
2
2.1k
Dynamic Feature Modules 入門
Avatar for punchdrunker punchdrunker
2
2.8k

Other Decks in Programming

See All in Programming
コードで差別化できない時代の ソフトウェアエンジニアリング / Software Engineering in an Era Where Code Doesn’t Differentiate
Avatar for Naoki Kishida kishida
2
180
AIで開発が速くなった先で、開発チームは何を目指すか
Avatar for Yuki Shiho shihochan
0
880
Herb in Rails 8.2: Your ERB views, now HTML-aware @ Rails World 2026, Austin, Texas
Avatar for Marco Roth marcoroth
0
220
Long Living Tokens, Die, Die, Die! (or: The One Ring is Banned in Modern)
Avatar for sylph01 sylph01
0
300
外から家のPCの電源入れたい！をＰＨＰで解決する
Avatar for かわしも（Shimokawa Shion） kawashimo0
1
130
AWS CDKのカスタムリソースでContinuum（旧Security Agent）を実装した話 | Implementing Continuum (formerly Security Agent) via AWS CDK Custom Resource
Avatar for アキキー | Akihisa Ikeda akihisaikeda
2
150
phperだってパンチカードでコーディングしたい
Avatar for hideki kinjyo o0h
PRO
0
330
Jetpack Compose Mechanisms
Avatar for Jaewoong skydoves
3
820
Herb in Rails 8.2: Your ERB views, now HTML-aware @ Kaigi on Rails 2026, Tokyo, Japan
Avatar for Marco Roth marcoroth
2
220
残高管理から台帳サービスへの進化
Avatar for kobaryo artoy
1
200
Verilogで学ぶCPU自作入門
Avatar for uyuki uyuki234
8
4.1k
R8 の設定見直しでアプリサイズ削減
Avatar for ANDPAD inc andpad
0
220

Featured

See All Featured
StorybookのUI Testing Handbookを読んだ
Avatar for Shingo Yamazaki zakiyama
31
7k
Designing Experiences People Love
Avatar for Jonathan Moore moore
143
24k
Noah Learner - AI + Me: how we built a GSC Bulk Export data pipeline
Avatar for Tech SEO Connect techseoconnect
PRO
0
460
svc-hook: hooking system calls on ARM64 by binary rewriting
Avatar for Akira Moroo retrage
2
630
Exploring the Power of Turbo Streams & Action Cable | RailsConf2023
Avatar for Kevin Liebholz kevinliebholz
37
6.6k
The Success of Rails: Ensuring Growth for the Next 100 Years
Avatar for Eileen M. Uchitelle eileencodes
47
8.4k
Getting science done with accelerated Python computing platforms
Avatar for Jacob Tomlinson jacobtomlinson
2
540
Building a Modern Day 
E-commerce SEO Strategy
Avatar for Aleyda Solis aleyda
45
9.3k
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
Avatar for Michelle Schulp Hunt marktimemedia
31
2.9k
New Earth Scene 8
Avatar for Sydney Stone popppiees
4
2.7k
エンジニアに許された特別な時間の終わり
Avatar for watany watany
109
250k
How To Stay Up To Date on Web Technology
Avatar for Chris Coyier chriscoyier
790
250k

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