I tried a little modified version of the RMGir_index one and the results are ... random. Especially since you do a lot more work in the benchmark than just the test you want to compare, the results depend on too many things and the actual different code seems to play only small part of it. I think you should at least change the benchmark_routine() to something like

sub benchmark_routine
{
    my ($testFn, $testName)=@_;

    foreach(@testCases) {
        my ($sentence, $wantedLetters, $expectedResult) = @$_;
        $testFn->($sentence, $wantedLetters) for (1..20);
        die "$testName test failed ($sentence, $wantedLetters)"
          unless (($testFn->($sentence, $wantedLetters))==$expectedRes
+ult);
    }
}
[download]

to give a little more weight to the tested subroutine. Not that it helped too much in this case.

sub RMGir_indexNot {
    my ($sentence, $wantedLetters)=@_;

    # don't need this variable (or any of them, in
    # fact -- they're just here for clarity.
    # we could work straight out of @_ if we wanted
    # this terser
    # Also, the $[ check is just pedantic - if someone
    # changes $[, shoot them.
    return !(grep index($sentence,$_)<$[,
                                  split //,$wantedLetters);
}
[download]

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.