While the new functions in core are a lot faster still, at least for any, List::Util has been way faster than grep. 

use strict;
use warnings;
use v5.42;
use feature 'keyword_any';
no warnings 'experimental::keyword_any';
use List::Util;
use Benchmark 'cmpthese';

my @list = 0 .. 1_000_000;
my %hash = map { $_ => 1 } @list;

cmpthese(-5, {
    'grep' => sub { return 1 if 0 != grep exists $hash{$_}, @list },
    'List::Util::any'  => sub { return 1 if List::Util::any { exists $
+hash{$_} } @list },
    'core any' => sub { return 1 if any { exists $hash{$_} } @list },
});

[download]
                  Rate            grep List::Util::any        core any
grep            14.1/s              --            -98%            -99%
List::Util::any  634/s           4412%              --            -46%
core any        1168/s           8209%             84%              --

[download]


The way forward always starts with a minimal test.

In reply to Re^3: Why doesn't exist work with hash slices? by 1nickt
in thread Why doesn't exist work with hash slices? by Anonymous Monk

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