Update the Mac OS X situation.

[p5sagit/p5-mst-13.2.git] / pod / perlsyn.pod

diff --git a/pod/perlsyn.pod b/pod/perlsyn.pod
index e6b420e..8f1af95 100644 (file)
--- a/pod/perlsyn.pod
+++ b/pod/perlsyn.pod
@@ -230,9 +230,10 @@ which is Perl short-hand for the more explicitly written version:
        # now process $line
     }
 
-Note that if there were a C<continue> block on the above code, it would get
-executed even on discarded lines.  This is often used to reset line counters 
-or C<?pat?> one-time matches.
+Note that if there were a C<continue> block on the above code, it would
+get executed only on lines discarded by the regex (since redo skips the
+continue block). A continue block is often used to reset line counters
+or C<?pat?> one-time matches:
 
     # inspired by :1,$g/fred/s//WILMA/
     while (<>) {
@@ -263,7 +264,7 @@ available.   Replace any occurrence of C<if BLOCK> by C<if (do BLOCK)>.
 
 =head2 For Loops
 
-Perl's C-style C<for> loop works exactly like the corresponding C<while> loop;
+Perl's C-style C<for> loop works like the corresponding C<while> loop;
 that means that this:
 
     for ($i = 1; $i < 10; $i++) {
@@ -279,8 +280,10 @@ is the same as this:
        $i++;
     }
 
-(There is one minor difference: The first form implies a lexical scope
-for variables declared with C<my> in the initialization expression.)
+There is one minor difference: if variables are declared with C<my>
+in the initialization section of the C<for>, the lexical scope of
+those variables is exactly the C<for> loop (the body of the loop
+and the control sections).
 
 Besides the normal array index looping, C<for> can lend itself
 to many other interesting applications.  Here's one that avoids the
@@ -391,8 +394,18 @@ structures.
     }
 
 There is no official C<switch> statement in Perl, because there are
-already several ways to write the equivalent.  In addition to the
-above, you could write
+already several ways to write the equivalent.
+
+However, starting from Perl 5.8 to get switch and case one can use
+the Switch extension and say:
+
+       use Switch;
+
+after which one has switch and case.  It is not as fast as it could be
+because it's not really part of the language (it's done using source
+filters) but it is available, and it's very flexible.
+
+In addition to the above BLOCK construct, you could write
 
     SWITCH: {
        $abc = 1, last SWITCH  if /^abc/;
@@ -484,7 +497,7 @@ Or
                                   "read-only";
         };
 
-Or if you are certainly that all the C<&&> clauses are true, you can use
+Or if you are certain that all the C<&&> clauses are true, you can use
 something like this, which "switches" on the value of the
 C<HTTP_USER_AGENT> environment variable.