Field Calculator for not null fields

[AndrewIngall1]

I am trying to use the field calculator to concatenate various fields into one new field.  The ArcGIS Arcade Guide gives the following example

Concatenate(['red', 'blue', 'green'], '/')

which gives red/blue/green.  This works fine when all of the fields contain a value, but how can i concatenate only the fields that are not null

I am trying to concatenate address details , so for example 

field1 = building name

field2 = building number

field3 = road name

field4 = area

field5 = town

in my example the building name or area could be null, so i end up with:-

,12,A Road,,Town - so i need to remove the additional field separators ','

Thanks for any help

[JoshuaBixby]

Not sure how it could get much simpler.  If the passing of field names is removed, the code boils down to:

', '.join([str(i) for i in [ ] if i])

That is pretty simple and compact.  The bulk of the line is in field names, and you can't remove them.

[KevinN_CSJ]

I know this thread is old, but in case anyone comes across this searching for this solution as I did, I got the code to work by replacing the full quotes "" with single quotes '' on line 17 when used in an AGOL custom field