qw(a - b = c ~ d ^) creates a list: "a", "-", "b", "=", "c", "~", "d", "^". Put that in braces, and you are initialising an anonymous hash. Use the arrow to dereference that hash. The brace to the right shows what key to use to dereference the hash. The key to use is the substring of $0 (the program name) - starting at position 0, length of 1.
It's like this:
my %underline = (
a => '-',
b => '=',
c => '~',
d => '^',
);
my $first_letter = substr($0, 0, 1);
my $pat = $underline{$first_letter};
Just a bit more concisely, and much less readably.
It's a cute trick, but I wouldn't recommend learning how to code from it ;-)
-
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.
|