Answer

Is Kotlin `object` thread-safe?

Yes. The initialization of an `object` singleton in Kotlin is thread-safe. It relies on the JVM's static initialization locking mechanism.

vs Object (Java)

In Java, you often had to write: ```java public class Singleton { private static Singleton instance; public static synchronized Singleton getInstance() { ... } } ``` Kotlin handles this automatically.

However, the properties inside the object are NOT automatically thread-safe. If you have a mutable var inside an object, you still need to synchronize access to it if multiple threads modify it.