How can the Singleton pattern be implemented in Kotlin?

In Kotlin, the Singleton pattern is implemented very simply using the object keyword. This declaration creates a class with a single instance, which is initialized lazily and thread-safely.

Example:

object DatabaseConnection {
    fun connect() {
        println("Connecting to the database")
    }
}

fun main() {
    DatabaseConnection.connect() // calling the singleton method
}

Thus, object guarantees that the instance will be the only one in the application, and there is no need to write additional code to implement the Singleton pattern.