PlantUML: Define a variable

PlantUML support two types of variables.

a.   Integers

b.   Strings: Enclosed in either single or double quotes

 

You can define a variable using $.

!$radius1 = 2
!$radius2 = "2.3456"

! (exclamation mark) is used to define preprocessing capabilities.

 

variables.txt

@startuml


!$radius1 = 2
!$radius2 = "2.3456"
!$msg = "Calculate area of circle for the radius : "

!$payload1 = $msg + $radius1
!$payload2 = $msg + $radius2

Client -> Server: $payload1
Server -> Client: Send response

Client -> Server: $payload2
Server -> Client: Send response


@enduml

Above snippet generate below diagram.

 

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