skeletorflet/opencode-supreme-setup/kotlin

kotlin

Core Concepts

• Null Safety: nullable types (T?), safe call (?.), Elvis operator (?:), non-null assertion (!!), smart casts
• Data Classes: auto-generate equals/hashCode/toString/copy/componentN from primary constructor
• Extension Functions: add methods to existing types without inheritance, receiver parameter syntax
• Sealed Classes: restricted class hierarchies, exhaustive when branches, sum type pattern

Coroutines & Flows

• Coroutines: suspend functions, launch/async builders, structured concurrency via scope
• Flows: cold asynchronous streams, terminal operators (collect/toList), intermediate (map/filter)
• Channels: hot streams for producer-consumer, rendezvous/buffered, ticker channels
• Dispatchers: Main (UI), IO (disk/network), Default (CPU), Unconfined (inherited)

Multiplatform & Compose

• KMP: shared business logic across JVM, JS, Native; expect/actual for platform declarations
• Compose Multiplatform: declarative UI framework, @Composable functions, state hoisting
• kotlinx.serialization: @Serializable annotation, JSON/protobuf/CBOR formats, polymorphic serialization
• Build system: Kotlin DSL for Gradle, multiplatform plugin, source set hierarchy