Javascript shorthand OR operation

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I have feeling this must be a duplicate, but I've been unable to find anything, probably due to different wording, or just because there really is nothing better.

I am generating kind of huge chunk of JS code, which "ORs" object properties with variables, while identifiers don't necessarily match. It looks like this (values are boolean):

a.borderline = a.borderline || borderline;
a.st1 = a.st1 || st;
a.ref64 = a.ref64 || ref;
...

To make it leaner I tried something like

a.st1 |= st;

but it makes a.st1 integer instead of boolean and I don't want to add another line with double negation to retype it back to boolean.

Using intuition I also tried ||=, which did not help :)

Is there any better (shorter) way of writing these commands?

asked 39 secs ago

Erlik

362