I have never seen this ...
$_ = "" => next unless defined;
... before. Could you explain how that works.
I'm not sure what part puzzles you, so...
- defined implicitly refers to $_.
- unless (...) { ... } can be written as ... unless ... if the block is just a simple statement.
- ... => ... is another way to write ... , ... (apart from the fact that => will autoquote any word left of it).
- In scalar context (ie the way used here) the comma (in either notation) evaluates its both arguments from left to right (and returns the value value of the last argument evaluated).
(You can find all details in perlsyn and perlop.)
In other words, that line is just one of the many variations of writing:
unless (defined $_) { $_ = ""; next }
— Arien
-
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.
|
