That behavior is, at least, fully documented. for loop variables are always localized (or lexically declared) to the block. Predicate-for cannot have a named loop variable. (Note: my situation did not concern itself with loop variables, but lexicals declared in the list of a block-for
are scoped to the block, while those in a predicate-for are scoped to the enclosing block/file)
It might be nice to expand the syntax to allow a reference to a scalar variable to be given as the loop variable, and the referenced variable would be used instead of a newly-created variable.
my $i = 123;
for \$i ( 0 .. 10 ) {
last if $i == 5;
}
print $i;
__END__
5
The present situation provides a use for a C-style for loop:
my $i = 123;
for ($i = 0; $i <= 10; ++$i) {
last if $i == 5;
}
print $i;
__END__
5
Caution: Contents may have been coded under pressure.
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
| |
For: |
|
Use: |
| & | | & |
| < | | < |
| > | | > |
| [ | | [ |
| ] | | ] |
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.