Learn KOTLIN with Real Code Examples
Updated Nov 17, 2025
Performance Notes
Prefer inline classes for performance
Use flows for efficient streams
Enable JVM optimizations in Gradle
Minimize coroutine context switching
Security Notes
Prefer immutable data classes
Use sealed classes for controlled states
Avoid unsafe casting (::class.java)
Validate external input in Ktor servers
Monitoring Analytics
Firebase Analytics for Android
Ktor + Prometheus for backend
OpenTelemetry tracing for JVM
Crashlytics for mobile apps
Code Quality
Enable Kotlin linting (ktlint/detekt)
Prefer immutable data structures
Avoid GlobalScope in coroutines
Use sealed classes for state