Re^3: Test if a string is a sub name


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Re^3: Test if a string is a sub name

by choroba (Cardinal)

on Oct 06, 2022 at 15:22 UTC ( #11147274=note: print w/replies, xml )

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in reply to Re^2: Test if a string is a sub name
in thread Test if a string is a sub name

It seems the documentation uses the term "subroutine name" in quite a confusing way. Check the examples:

Use of a subroutine call, rather than a subroutine name, as an argument to exists is an error.
exists &sub;    # OK
exists &sub();  # Error
[download]

So, in this context, "subroutine name" includes the ampersand.

Considering strict, note the exceptions to strict 'refs':

$bar = \&{'foo'};
&$bar;
[download]

We are not calling the subroutine, we're just checking it exists/is defined.

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

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