kotlin-coding-standards

Use safe calls (?.) to chain nullable access, the Elvis operator (?:) to supply defaults, and safe casts (as?) for type conversion. Smart casts apply automatically after null checks, and early returns keep non-null flows explicit.

Use runTest from kotlinx-coroutines-test with a StandardTestDispatcher, and set Dispatchers.setMain in setup for ViewModel tests. For Flows, use Turbine's test block with awaitItem and awaitComplete to assert emissions in order.

StateFlow always holds a current value and replays the latest emission to new collectors, making it suited for UI state. SharedFlow has no initial value and is used for one-shot events like error messages or navigation signals.

Apply the detekt and ktlint Gradle plugins, point detekt at a detekt.yml config file, and enable rules for complexity, naming, coroutines, and exceptions. The included setup script generates a project with both tools preconfigured.

Use let for null checks and transformations, apply for configuring an object and returning it, also for side effects like logging, and run or with when combining configuration with a computed result. Choosing by receiver type and return value keeps code readable.

Yes, the reference includes Spring Boot patterns such as coroutine-based REST controllers, JdbcTemplate repositories, and WebFlux functional routers using coRouter with suspend handler functions.