Boolean context is ubiquitous, so let's give this little brother of list and scalar its due!
"Boolean context" is 100% identical with scalar context.
It is a fiction.
That is not a context, because expressions are not evaluated
in double-quoted strings. What value does localtime()
produce in "The time is: localtime()\n"
This one is a little different. For built-in Perl operators,
it's identical to scalar context. The only time it might
be different is for a user-defined function that explicitly
tests whether wantarray
yields an undefined
value, and which does something different if so. Regardless,
there's no question about what the return value is.
The interesting one I think you left out is that
the argument of defined is a different kind of context.
defined(&foo) doesn't even call &foo.
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