Repeat expression [n] times?

What I’m wondering is if there is some sort of loop in TiddlyWiki?
Like repeat a calculation until a variable is below a defined value? Or repeat until it is over a defined value?

There are operators which enable checking a value of other filter operations (e.g. the compare operator) but I have no good idea for not executing other parts when the condition is fulfilled.

Sorry for the lack of a precise example but this is something what came to my mind several times before I found other ways to solve my problem (without looping).