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Well that's not quite what I'm after -- I'm hoping to include two or three elements, not choose which of two values to use for the second element.

In Perl, this is simply

$x = dosomething(
...

This is probably an easy one for you Javascript wonks...

I'm looking for a way to conditionally include or exclude a list element -- in Perl this is easy, how's it done in Javascript?

x =...