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TIMTOWTDI, both are fine.

IIRC old versions of Perl had limitations with map in void context, but that's history.

Some might argue that this is more readable

for my $key ( keys %hosts ) { if ( $hosts{$key} != $table_count ) { delete $hosts{$key}; } }

Cheers Rolf

( addicted to the Perl Programming Language)

update

inverted unless to if

update
this works
while ( my ($key,$value) = each %hosts) { delete $hosts{$key} if $value != $table_count; }

but I'm not sure about side effects!

edit

aha -> each

If you add or delete elements of a hash while youíre iterating over it, you may get entries skipped or duplicated, so donít. Exception: It is always safe to delete the item most recently returned by "each()", which means that the following code will work:

while (($key, $value) = each %hash) { print $key, "\n"; delete $hash{$key}; # This is safe }

In reply to Re: map {} list or do {} for list? by LanX
in thread map {} list or do {} for list? by Random_Walk

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