Author: lwall
Date: 2009-11-20 18:43:16 +0100 (Fri, 20 Nov 2009)
New Revision: 29153
Modified:
docs/Perl6/Spec/S03-operators.pod
Log:
[S03] add infix:<else> to match infix:<also>, suggested by TheDamian++
Modified: docs/Perl6/Spec/S03-operators.pod
===================================================================
--- docs/Perl6/Spec/S03-operators.pod 2009-11-20 17:25:59 UTC (rev 29152)
+++ docs/Perl6/Spec/S03-operators.pod 2009-11-20 17:43:16 UTC (rev 29153)
@@ -16,7 +16,7 @@
Created: 8 Mar 2004
Last Modified: 20 Nov 2009
- Version: 178
+ Version: 179
=head1 Overview
@@ -963,12 +963,12 @@
C<< infix:<&> >>, but with left-to-right evaluation guaranteed, for use
in guarded patterns:
- $target ~~ MyType also .mytest1 also .mytest2
+ $target ~~ MyType also *.mytest1 also *.mytest2
This is useful when later tests might throw exceptions if earlier
tests don't pass. This cannot be guaranteed by:
- $target ~~ MyType & .mytest1 & .mytest2
+ $target ~~ MyType & *.mytest1 & *.mytest2
=back
@@ -984,6 +984,24 @@
=item *
+C<< infix:<else> >>, short-circuit junctional or operator
+
+ EXPR else EXPR else EXPR ...
+
+Can be used to construct ORed patterns with the same semantics as
+C<< infix:<|> >>, but with left-to-right evaluation guaranteed, for use
+in guarded patterns where the left argument is much more easily
+falsifiable than the right:
+
+ $target ~~ *.mycheaptest else *.myexpensivetest
+
+This is also useful when you want to perform tests in order
+of safety:
+
+ $target ~~ MyType else *.mysafetest else *.mydangeroustest
+
+=item *
+
C<< infix:<^> >>, one() operator
$a ^ $b ^ $c ...
