# Kotlin Coroutinesとflow (Android)

> Coroutinesを使った非同期プログラミング：launch、async、suspend functions、Dispatchers、Flow、StateFlow、SharedFlow

- 20 面接問題
- Mid-Level
- [面接問題: Android](https://sharpskill.dev/ja/technologies/android/interview-questions.md)

## 1. Kotlinにおけるcoroutineとは何ですか？

**回答**

coroutineは軽量なthreadで、非同期コードを逐次的に記述できます。threadをブロックせずにsuspendでき、他のタスクを実行できます。従来のthreadより効率的です。

## 2. launchとasyncの違いは何ですか？

**回答**

launchは結果を返さないcoroutineを開始します（Jobを返す）。asyncはDeferred（await()）を介して結果を返すcoroutineを開始します。結果が必要な場合はasyncを使用します。

## 3. suspendキーワードは何のために使いますか？

**回答**

suspendはthreadをブロックせずにsuspendして後で再開できる関数をマークします。これらの関数は他のsuspend functionsまたはcoroutinesからのみ呼び出せます。非同期処理を可能にします。

## さらに17問利用可能

- coroutinesにおけるDispatcherとは何ですか？
- Dispatchers.IOはいつ使いますか？

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