In other languages, such as Java, lazy initialization is often used in conjunction with the factory method design pattern. This method usually checks whether the object/variable we want to use is initialized; if not, it initializes the object and finally returns it. In consecutive uses, the already initialized object/variable is returned.
The Scala programming language has built-in support for lazy initialization. It makes use of the lazy keyword. That's why providing a class diagram in this case is pointless.
