How to check if unit already exists?

[petermarks12]

Hi,

I have created a custom unit using math.createUnit(). Now, I want to check if that unit exist or not, so that I should not end up creating same unit again.

Is there any way to retrieve list of all units, so that I can verify this?

[josdejong]

Hm, you could use math.type.Unit.isValuelessUnit('cm') I think.