Unfortunately, it's still altering an array (or it might have been a hash) over which you're iterating and so still incorrect: 

c:\@Work\Perl\monks>perl -wMstrict -le
"my @colors = qw(red green blue yellow pink purple brown);
 my @drop = qw(pink purple);
 while ( my ($num, $val) = each @colors ) {
   if ($val eq $drop[0] or $val eq $drop[1]) {
     splice (@colors, $num, 1);
   }
 }
 print qq{@colors};
"
red green blue yellow purple brown

[download]

Update: each sez:

If you add or delete a hash's elements while iterating over it, the effect on the iterator is unspecified; for example, entries may be skipped or duplicated--so don't do that.
The same obviously applies to arrays. The each doc goes on to discuss a specific exception involving delete and hashes, but still no joy WRT arrays.

Give a man a fish:  <%-{-{-{-<

In reply to Re^2: The error says the value is uninitialized, but it works anyway by AnomalousMonk
in thread The error says the value is uninitialized, but it works anyway by mizducky

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