Optional function parameter indication in UML Sequence Diagram

user_9332814 0
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Is there any formal way to signal that a function parameter is optional?

For example, in this image:in this image

I want to inform that the nodes_clicked parameter could be populated or left empty.

Thanks.

notation sequence-diagram uml
2 Answers

Optional parameters are nothing handled in UML as it's jus "syntactic sugar" compilers implement to make coders happy. You can mimic that in a SD with a note attached to the message. However, I just would not go to that detail and leave it to the coder (they aren't children you have to tell each single step to take).

user_33796530

Sequence diagrams represent sequence of function calls. Each messages calls functions with their parameters and the values of these parameters. So you can not model the fact that a parameter can have a value or another...

user_13287530
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