Why this code block function always return null?

1

I try to loop through a list of strings, below is the simplified version. But I always get null as return. Any idea why?

tst
tst.png673×597 39.6 KB

Thanks in advance!

2

What Dynamo version are you in?

3

Hi @jacob.small,

I’m using the latest supported version for Revit 2016, which is 1.3.2.

4

What result are you looking for?

5

I expected the strings to be extracted in the loop (the code above is just an example, I try to make use of the extracted strings with miscellaneous nodes inside the loop)

6

You shouldn’t need to extract them based on that data structure. Just iterating over your list should do without the sub-function, but I’d need to see more of your graph to provide better input.