Re^3: Trouble grepping values when hash contains multiple values per key

Is there any way to force grep to evaluate these in a scalar context in order to return a "true" or "false" in this case?

Yes, evaluate grep in scalar context. It's that easy!

my $found_any = grep { ... } @whatever;

Boolean context is also a scalar context.

Comment on Re^3: Trouble grepping values when hash contains multiple values per key Download Code

Replies are listed 'Best First'.
Re^4: Trouble grepping values when hash contains multiple values per key by eyepopslikeamosquito (Archbishop) on Jun 06, 2010 at 03:13 UTC
`my $found_any = grep { ... } @whatever;` [download] Because grep always iterates through the entire list, to stop on the first one found, you might try instead: `use List::MoreUtils qw(any); my $found_any = any { ... } @whatever;` [download] or: `use List::Util qw(first); my $found_any = defined first { ... } @whatever;` [download] ...though, in practice, it is unlikely to matter, performance-wise, unless `@whatever` is huge. As an aside, note that both `any` and `first` are built in to Perl 6.	[reply] [d/l] [select]

Replies are listed 'Best First'.

my $found_any = grep { ... } @whatever;
[download]

use List::MoreUtils qw(any);
my $found_any = any { ... } @whatever;
[download]

use List::Util qw(first);
my $found_any = defined first { ... } @whatever;
[download]

@whatever

As an aside, note that both any and first are built in to Perl 6.