Change 21166 by [EMAIL PROTECTED] on 2003/09/10 19:36:30
Remove the warning in perlfaq about using map in void context :
From: [EMAIL PROTECTED] (Abigail)
Subject: [PATCH perlfaq6] map in a void context.
Date: Tue, 9 Sep 2003 10:31:58 +0200
Message-ID: <[EMAIL PROTECTED]>
Affected files ...
... //depot/perl/pod/perlfaq6.pod#43 edit
Differences ...
==== //depot/perl/pod/perlfaq6.pod#43 (text) ====
Index: perl/pod/perlfaq6.pod
--- perl/pod/perlfaq6.pod#42~20997~ Tue Sep 2 07:58:21 2003
+++ perl/pod/perlfaq6.pod Wed Sep 10 12:36:30 2003
@@ -679,14 +679,17 @@
hope to know on these matters (a full citation appears in
L<perlfaq2>).
-=head2 What's wrong with using grep or map in a void context?
+=head2 What's wrong with using grep in a void context?
-The problem is that both grep and map build a return list,
-regardless of the context. This means you're making Perl go
-to the trouble of building a list that you then just throw away.
-If the list is large, you waste both time and space. If your
-intent is to iterate over the list then use a for loop for this
+The problem is that grep builds a return list, regardless of the context.
+This means you're making Perl go to the trouble of building a list that
+you then just throw away. If the list is large, you waste both time and space.
+If your intent is to iterate over the list, then use a for loop for this
purpose.
+
+In perls older than 5.8.1, map suffers from this problem as well.
+But since 5.8.1, this has been fixed, and map is context aware - in void
+context, no lists are constructed.
=head2 How can I match strings with multibyte characters?
End of Patch.
