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Re: Removing array elements

by rjbs (Pilgrim)
on Aug 24, 2005 at 00:40 UTC ( #486058=note: print w/replies, xml ) Need Help??

in reply to Removing array elements

(Update: the above solution using reverse is cooler and better than this one.

I would suggest using splice rather than delete for this purpose, but either way you're going to have to use something other than for over the array.

Like a lot of things the "three-part" or "C-style" for loop should be avoided in general, but used when needed. Don't feel that you must never use it.

my @foo = (1,2,2,1) x 5; my @bar = (2) x 20; for (my $i = 0; $i < @foo; $i++) { print "$i\n"; if ($foo[$i] % $bar[$i]) { splice @foo, $i, 1; $i-- } } print "@foo\n";
Because you're removing the element at $i when you use splice, you have to decrement it so that the next time you find the element that used to be at $i + 1. The splice will change the size of @foo, so the comparison in the for loop will refer to the current list size.

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