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Re^3: Where is $# fully documented?

by ysth (Canon)
on Sep 23, 2014 at 17:25 UTC ( #1101688=note: print w/replies, xml ) Need Help??


in reply to Re^2: Where is $# fully documented?
in thread Where is $# fully documented?

Special function? No.

The a in @a is the identifier part of the variable name; the documentation addresses anywhere you'd put that a, which includes $#a.

Update: hmm, it does say "as part of a variable...name", implying it would only work if $#a is a considered a variable. I shy away from that because, even though it is an assignable lvalue, it really is just an attribute of an array variable. So the doc could use a minor tweak.

In any case, $#$arrayref / $#{$arrayref} ought to be added to the examples there.

--
A math joke: r = | |csc(θ)|+|sec(θ)| |-| |csc(θ)|-|sec(θ)| |

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Re^4: Where is $# fully documented?
by LanX (Archbishop) on Sep 24, 2014 at 09:43 UTC
    > I shy away from that because, even though it is an assignable lvalue, it really is just an attribute of an array variable. So the doc could use a minor tweak.

    That's my point, I couldn't mentally map this behavior to normal dereferencing mechanics cause it rather feels like a magic feature.

    To make it more obvious, theoretically we could have a special syntax for keys and values of a hash ( like e.g. %<hash ).

    This would be a similar beast (/me struggling for a name ;)

    > In any case, $#$arrayref / $#{$arrayref}ought to be added to the examples there

    Definitely!

    Cheers Rolf

    (addicted to the Perl Programming Language and ☆☆☆☆ :)

      we could have a special syntax for keys and values of a hash ( like e.g. %<hash ).

      It couldn't be a variable since it's a list of values. It wouldn't make sense to give it the syntax of a variable since you couldn't do anything to it that you could do to a variable.

      Unless you mean keys in scalar context. That's an lvalue function that returns a magical variable like substr. As such, that could be made into a variable (e.g. keys(%h) = 123; could be made into %#h = 123;).

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