Beefy Boxes and Bandwidth Generously Provided by pair Networks
good chemistry is complicated,
and a little bit messy -LW

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

It is more normal just to shift it out and normal ways are more maintainable.

I can respect that it isn't a style you feel comfortable with or are familiar with, but I wouldn't go so far as to call it unusual or abnormal.

For one, using undef as a placeholder in a list on the left hand of an assignment is a perfectly valid use of Perl syntax. No less than Larry Wall documents its usage in the book Programming Perl (p. 819). Lest one relegate this to some ancient deprecated version of Perl, this usage is also documented even today in undef.

For another, the use of undef in a list preserves the order of parameters without all the visual noise created by shift statements. One might argue that is is more self-documenting and hence more maintainable.

Finally, and this is probably most important, shifting parameters out of @_ can make debugging more difficult. If you die and need a stack trace, the shifted out parameters will sometimes display as "undef" being passed to your function call, even though the actual value passed into the function call was absolutely not undef.

In reply to Re^2: Is undef list assignment a no-op? by ELISHEVA
in thread Is undef list assignment a no-op? by repellent

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

  • 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.
Log In?

What's my password?
Create A New User
Domain Nodelet?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others romping around the Monastery: (3)
As of 2023-10-03 13:55 GMT
Find Nodes?
    Voting Booth?

    No recent polls found