Here's a technique you might find useful if you have Perl 5.10 or higher. 

$ perl -Mstrict -Mwarnings -E '
> my @x = (0 .. 10);
> my @y = grep { state $z = 0; $_ == 3 and $z = 1; $z } @x;
> say qq{@y};
> '
3 4 5 6 7 8 9 10

[download]

Update: I changed $_ > 3 to $_ == 3 to better illustrate the principle.

Sorry. Crap answer - see JavaFan's comments (below) for the reason why. Only read the first half of the question. Here's a better answer, in the same vein. 

$ perl -Mstrict -Mwarnings -E '
> sub blah { my $z = 0; [ grep { /3/ and $z = 1; $z } @_ ] }
> my @x = (0 .. 10);
> say qq{@{blah(@x)}};
> my @y = qw{a b c 3 d e f};
> say qq{@{blah(@y)}};
> '
3 4 5 6 7 8 9 10
3 d e f

[download]

-- Ken

In reply to Re: flip-flop flop by kcott
in thread flip-flop flop by morgon

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