I do not personally like one-armed IF, but let me point out that AND/OR
can also be used instead of WHEN/UNLESS. In fact, AND/OR can be more concise
than WHEN/UNLESS when there is more than one condition. Having said that,
using AND/OR this way does feel somewhat artificial in some cases, and I would
in some cases rather use WHEN/UNLESS if it were standardized. In such a case,
I would prefer it to be in the base library.
Andre
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