#!/usr/bin/perl -w

my $nkeys = 10;

my @keys;
our $key; # (keep last key for lookup below)
for (1..$nkeys) {
    # generate random keys consisting of 3..10 chars
    $key = join "", map chr(97+int(rand(26))), (1..3+int(rand(8)));
    push @keys, $key;
}

# setup 'if'-code
my $code = "sub isMember_if {\n"
           . join("", map "return 1 if \$_[0] eq '$_';\n", @keys)
           . "return 0;}";
#print "$code\n";
eval $code;

# setup hash
my %hash = map { $_ => 1 } @keys;
sub isMember_hash { return $hash{$_[0]} };


use Benchmark 'cmpthese';

cmpthese( -1, {
    'if'   => 'isMember_if($key)',
    'hash' => 'isMember_hash($key)'
});

##</code><code>##

          Rate   if hash
if    628278/s   -- -68%
hash 1946613/s 210%   --