Is there a way to do an early exit from a loop

Question

It would be great if it was possible to do an early exit out of a loop in activity diagrams (new syntax). There is an early version of goto, but it only works backwards, so it is not so useful for this one.

Something along the lines of (this does not work yet):

:loop over all instances to find a free one
while (instance exists?)
if (free?) then (yes)
:reserve this instance;
break
endif
:get next instance;
endwhile

Regards, Ville

 

Answer 1

Hello V.,

Just to answer to an old unanswered question (and confirm that is now OK);
from 'break' feature creation:

• https://forum.plantuml.net/5206/please-provide-the-ability-to-break-from-loops?show=5240#a5240

Then here is the result of your code:

[See on PlantUML server]

[Just to answer to an old unanswered question (and confirm that is now OK)]
Regards,
Th.

Comments

Hi The-Lu,

The result does not look very pleasing to the eye, even though it is technically correct.

If the "get the next instance" would be parallel to the "reserve this instance" the result would look much easier to understand. I wonder if one could do this by some alterations to the source code.

Regards, Ville

---

Hello Ville,

Yes... for that:

• Put just the action ":get next instance;" on a else branch on the if:

[See on PlantUML server]

If that can help,
Regards,
Th.