switch is more flexible;
if and switch accept an optional
initialization statement like that of for;
+break and continue statements
+take an optional label to identify what to break or continue;
and there are new control structures including a type switch and a
multiway communications multiplexer, select.
The syntax is also slightly different:
@@ -781,7 +783,46 @@ func shouldEscape(c byte) bool {
-Here's a comparison routine for byte slices that uses two
+Although they are not nearly as common in Go as some other C-like
+languages, break statements can be used to terminate
+a switch early.
+Sometimes, though, it's necessary to break out of a surrounding loop,
+not the switch, and in Go that can be accomplished by putting a label
+on the loop and "breaking" to that label.
+This example shows both uses.
+
+Loop:
+ for n := 0; n < len(src); n += size {
+ case src[n] < sizeOne:
+ if validateOnly {
+ break
+ }
+ size = 1
+ update(src[n])
+
+ case src[n] < sizeTwo:
+ if n+1 >= len(src) {
+ err = errShortInput
+ break Loop
+ }
+ if validateOnly {
+ break
+ }
+ size = 2
+ update(src[n] + src[n+1]<<shift)
+ }
+ }
+
+
+
+Of course, the continue statement also accepts an optional label
+but it applies only to loops.
+
+To close this section, here's a comparison routine for byte slices that uses two
switch statements: