Kotlin Interview Questions

Kotlin is a statically typed, cross-platform, general-purpose programming language with type inference.

It is fully interoperable with Java and runs on the JVM, making it ideal for Android development.

Kotlin was officially endorsed by Google as a first-class language for Android development.

It reduces boilerplate code, increases safety with null safety features, and improves productivity with concise syntax and expressive APIs.

Kotlin introduces null safety at the language level to avoid null pointer exceptions at runtime.

Variables can't hold null values by default. To declare nullable types, you append a question mark to the type (e.g., String?).

Safe calls (?.), Elvis operator (?:), and smart casts help handle nulls gracefully.

Null safety makes code safer and more reliable by forcing developers to handle null cases explicitly.

Coroutines are lightweight threads for writing asynchronous and non-blocking code in Kotlin.

They allow you to write asynchronous code sequentially without callbacks, making it readable and easy to manage concurrency.

Coroutines are launched using the launch { } builder and run within Dispatchers to specify the thread pool (Main, IO, Default).

They are especially useful for Android development to avoid blocking the main thread and improve performance.