The sub is always returning a scalar or a list. Never an array.
The context of the caller is provided to the last expression evaluated in the subroutine. That expression then evaluates to a scalar or list, and that scalar
or list is returned.
In your ret_array, a scalar context evaluation of @_ is clearly
the number of elements of the _ array, while a list context evaluation
is the current contents of the _ array. But it's not "returning" the array.
It's returning a copy of the contents (as a list), or the count (as a scalar).
Similarly, for the ret_list subroutine, a scalar context is passed down
to the subroutine to cause the last element of that slice to be returned (as a scalar),
or in a list context, the entire contents of the _ array are returned
(as a list).
Again, at no time is the "array" returned. You're either returning the last expression
evaluated in a list context as a list, or the last expression evaluated in a scalar context as a scalar.
-- Randal L. Schwartz, Perl hacker
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