With this one:

while (my $result = shift(@$rowcache) )

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If @$rowcache contains a false value (e.g. undef, or the empty string, or the number 0), then when that value is reached, the condition will become false, so the while loop will exit.

If you really want to use while, then you could do:

while (my ($result) = @$rowcache ? shift(@$rowcache) : ())

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Or, if you know that @$rowcache consists of only defined values (no undefs, but perhaps some empty strings and zeros), you could do:

while ( defined(my $result = shift @$rowcache) )

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use Moops; class Cow :rw { has name => (default => 'Ermintrude') }; say Cow->new->name

In reply to Re: Different result for 'foreach' vs 'while shift' arrayref by tobyink
in thread Different result for 'foreach' vs 'while shift' arrayref by gvandeweyer

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