If you absolutely must modify an array in place with deletes, then you could do it this way: 

    for my $i ( reverse 0 .. $#a ) {
        splice( @a, $i, 1 )
            if should_delete;
    }

[download]

You could but I wouldn't recommend it. Count down in a while loop.

Normally when I feel the need to alter an array in place, I won't want to create the lists  0 through  $#a and  $#a through  0.

The new foreach optimization of the range operator would be much more useful if the behaviour of $#a .. 0 had not changed. Oh well.

In reply to Re: Re: What's the idiom for finding and removing the found @ARRAY element? by rir
in thread What's the idiom for finding and removing the found @ARRAY element? by John M. Dlugosz

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • 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:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.