If you test a particular array for the existance of many values, it might be faster/easier to understand to use the Schwartzian Transform. For example: 

my $matches = 0;
foreach my $item (@items) {
  $matches++ if grep( $item eq $_, @list );
}
print "All match!" if $matches == @items;

[download]

becomes: 

my %st = map { $_ => undef } @list;
my $matches = 0;
foreach my $item (@items) {
  $matches++ if exists $st{$item};
}
print "All match!" if $matches == @items;

[download]

The larger @items gets (relative to @list), the better the latter performs relative to the former. I don't know where the 0-point lies -- that is, I don't know at what point it becomes faster to use the latter form -- so use of Benchmark and Devel::DProf (and friends) would be essential.

It would be interesting (though decidedly niche) to see a module where the %st hash would be automatically maintained every time a particular array was updated. I'd probably use overload to create an interface like: 

use List::AutoST;
my $list = List::AutoST->new();

# these appear to behave like normal
push @list, $some, $values, $here;
$list[1] = $value2;

# but then...
print "Ok!" if $list->has('this value');

# or (also via overload)
print "Ok!" if exists $list{'this value'};

[download]

I don't know about performance differences for that, but it would make an interesting and eas(y|ier) approach.

<–radiant.matrix–>
A collection of thoughts and links from the minds of geeks
The Code that can be seen is not the true Code
I haven't found a problem yet that can't be solved by a well-placed trebuchet

In reply to Re: RFC: Text::Grap by radiantmatrix
in thread RFC: Text::Grap by kwaping

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