I am unclear about the $munged() bit of code in your description. &$munged() would work, were $munged a code reference. As for the effeciency of your approach, i would run it all through Benchmark, for any other opinions would be but opinions. It maybe quicker to do something like

if ($uclc eq 'lc') {
  ... for loop with lc
} elsif ($uclc eq 'uc') {
  ... for loop with uc
} else {
    die "invalid arg";
}
[download]

it may be slightly fatser, but check benchmark

---

Thus spake the Master Programmer:
"When you have learned to snatch the error code from the trap frame, it will be time for you to leave."
-- The Tao of Programming

---

---

• Are you posting in the right place? Check out Where do I post X? to know for sure.
• Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:

  <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>

• Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
• Want more info? How to link or How to display code and escape characters are good places to start.