Beefy Boxes and Bandwidth Generously Provided by pair Networks
Your skill will accomplish
what the force of many cannot

Re: NEWBIE Brain Teaser #2, by nysus

by snafu (Chaplain)
on Apr 16, 2001 at 08:22 UTC ( #72765=note: print w/replies, xml ) Need Help??

in reply to NEWBIE Brain Teaser #2, by nysus

Well, I cheated and ran the script to see what would happen.
But I will offer a guessed explanation.

The first script I ran was as is shown above. My output was:

"In the beginning there was , in the end there will be . "

B: I believe the output was this way because when the subroutine
was called via the subroutine(); nothing was passed to the subroutine via the '()' thus there
were no valid local (to the subroutine) variables called
'_' therefore nothing being substituted in those slots.

C: On the other hand when you change the subroutine(); to &subroutine; it printed:

"In the beginning there was nothing, in the end there will be nothing. "

The reason this occurred is because when calling a subroutine
with the '&' the sub automagically "sees" the global scalar
array named '_'.

I admit, lexical scope vs dynamic scope is still confusing to me and
arrays with scope are questionable by me too. I'd be
interested to know how close I am to being correct.

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://72765]
[1nickt]: What do you all think of experimental = refaliasing ? Anyone using it?
[1nickt]: \my %foo = { bar => 1 }; say $foo{bar};
[Corion]: 1nickt: Would be great, especially for naming parameters in @_.
[Corion]: When you pass an arrayref, you get to treat it like a local array. But then, I'm cautious with the experimental features, because just when I thought function signatures were a set thing, there is a proposal to use sub [ $foo, $bar ] { ... } to ...
[Corion]: ... declare the parameters, instead of the more common sub ($foo, $bar) { ... }

How do I use this? | Other CB clients
Other Users?
Others meditating upon the Monastery: (7)
As of 2017-11-17 20:38 GMT
Find Nodes?
    Voting Booth?
    In order to be able to say "I know Perl", you must have:

    Results (272 votes). Check out past polls.