That doesn't match his example very well. I would think it was a fine solution except he said his example works. His example seems to return (or print really) a list consisting of every possible reversal of a single pair of neighboring letters. I.e. transposition_list('foobar') would be the list ('ofobar', 'foobar', 'foboar', 'foobra'). I'm not sure how to handle double letters like the 'oo' in 'foo' but his doesn't handle them specially.

I don't know if I really would do it this way but here is my untested first crack at it:

print "$_\n" for transposition_list('thisisatest'); 

sub transposition_list {
    my $string = shift; 
    my @transpositions; 

    for my $i (0 .. length($string)-2) { 
        (my $tmp = $string) =~ s/(.{$i})(.)(.)/$1$3$2/;
        push @transpositions, $tmp; 
    }

    return @transpositions; 
}

[download]
-sauoq
"My two cents aren't worth a dime.";

In reply to Re: Re: Transposition of each letter pair in string by sauoq
in thread Transposition of each letter pair in string by Cody Pendant

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • 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! —
  • 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:
    & &amp;
    < &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.