A constructor/factory, takes no parameters but creates a new value of type T every call.
An executable piece of code that takes no parameters and doesn't return any value.
A Function interface.
A Function interface.
This class represents optional values.
A Procedure is like a Function, but it doesn't produce a return value.
A Procedure is like a Function, but it doesn't produce a return value.
An executable piece of code that takes no parameters and doesn't return any value.