DefaultArgumentsExample.kt

fun create(credentials: Credentials,
           channel: CommunicationChannel = SecuredCommunicationChannel(),
           loggingStrategy: LoggingStrategy = DefaultLoggingStrategy(), 
           host: String = Environment.PRODUCTION_HOST): Proxy {
    ...
}

/* This method could be called like this: */

val credentials = ...
val proxy = factory.create(credentials)