Passthrough, how can i understand that?

DesignScript
6

It is simply just creating a list and then getting the first item in the list. So it could be rewritten as:

List.FirstItem(passthrough,waitfor);

Or you could even simplify it further and just do a code block with:

[a,b][0];

It acts as a gate because Dynamo has to “collect” all of the items in the list before passing the contents on to the next node.

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