bytes: add example for (*Buffer).Next

Change-Id: Ic0a97fd7bb89865448e436e5c092415a29d8badf
Reviewed-on: https://go-review.googlesource.com/c/go/+/352009
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: David Chase <drchase@google.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/src/bytes/example_test.go b/src/bytes/example_test.go
index ae93202b57..d0d4dd2c2d 100644
--- a/src/bytes/example_test.go
+++ b/src/bytes/example_test.go
@@ -54,6 +54,19 @@ func ExampleBuffer_Len() {
 	// Output: 5
 }
 
+func ExampleBuffer_Next() {
+	var b bytes.Buffer
+	b.Grow(64)
+	b.Write([]byte("abcde"))
+	fmt.Printf("%s\n", string(b.Next(2)))
+	fmt.Printf("%s\n", string(b.Next(2)))
+	fmt.Printf("%s", string(b.Next(2)))
+	// Output:
+	// ab
+	// cd
+	// e
+}
+
 func ExampleCompare() {
 	// Interpret Compare's result by comparing it to zero.
 	var a, b []byte