While $_ in a map is an alias, it doesn't mean that $_ in
rvalue context magically resolves to the alias instead of
the value. Watch:
perl -wle '@a = 1; @b = map {++ $_ -> [0]} map {[$_]} @a; print "@a";
+print "@b"'
1
2
No alias passes out of the right-most map.
Or a shorter example:
perl -wle '@a = 1; @b = map {$_} @a; $a [0] ++; print "@a @b"'
2 1
@b isn't an array whose elements are aliases for the elements of @a.
Abigail
-
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.
|