Re^5: Perl's feature to determine, in current point of loop, that this is the last one?


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Re^5: Perl's feature to determine, in current point of loop, that this is the last one?

by LanX (Saint)

on Jan 24, 2022 at 08:44 UTC ( [id://11140785]=note: print w/replies, xml )

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in reply to Re^4: Perl's feature to determine, in current point of loop, that this is the last one?
in thread Perl's feature to determine, in current point of loop, that this is the last one?

> It's so easy to avoid the limitation.

unfortunately no, but good idea nonetheless ... :)

  DB<39> x @input
0  2
1  7
2  11
3  15
  DB<40> use experimental 'refaliasing'; \$input[1] = \$input[-1]

  DB<41> x @input
0  2
1  15
2  11
3  15
  DB<42> for my $v (@input) { say $v if \$v==\$input[-1] }
15
15

  DB<43>
[download]

I'm not even sure that experimental feature is even needed...

IIRC one could somehow use typeglob aliasing on array elements.

Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery}

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Re^6: Perl's feature to determine, in current point of loop, that this is the last one?
by ikegami (Patriarch) on Jan 25, 2022 at 14:46 UTC

unfortunately no, but good idea nonetheless ... :)

Good catch. I'll add a warning to my answer that first suggested the idea.

I'm not even sure that experimental feature is even needed...

Correct.

my $inputs = sub { \@_ }->( 0, $x, $x );

for my $v (@$inputs) {
   say \$v;
}
[download]

SCALAR(0x559bb5b21960)
SCALAR(0x559bb5b33228)
SCALAR(0x559bb5b33228)
[download]

I imagine that would Data::Alias can also achieve this.

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