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$\begingroup$ This property is called short circuiting and it's not only about efficiency. You can safely use a && b even when b wouldn't correctly run unless a has evaluated to True. E.g. StringQ[s] && StringStartsQ[s, "x"] $\endgroup$

Szabolcs
– Szabolcs

2016-10-23 03:27:58 +00:00
Commented Oct 23, 2016 at 3:27
$\begingroup$ @Szabolcs Hm, forgot about that. Thanks for telling me. $\endgroup$

JungHwan Min
– JungHwan Min

2016-10-23 03:32:41 +00:00
Commented Oct 23, 2016 at 3:32

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```
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