How to concatenate differently sized vectors in Julia?

How can I concatenate arrays of different size with a "filler" value where the arrays don't line up?

a = [1,2,3]  b = [1,2]  

And I would like:

[1 2 3   1 2 missing]  

Or

[1 2 3   1 2 nothing]  

https://stackoverflow.com/questions/65730296/how-to-concatenate-differently-sized-vectors-in-julia January 15, 2021 at 11:55AM