bytes: mention strings.Builder in Buffer.String docs

Fixes #22778

Change-Id: I37f7a59c15828aa720fe787fff42fb3ef17729c7
Reviewed-on: https://go-review.googlesource.com/80815
Reviewed-by: Ian Lance Taylor <iant@golang.org>

diff --git a/src/bytes/buffer.go b/src/bytes/buffer.go
index 67771846fc492d03c367bb2a0b30bf969932c76b..dc9d5e95d32ba1c457bbf12e6e011f493397da0b 100644 (file)
--- a/src/bytes/buffer.go
+++ b/src/bytes/buffer.go
@@ -56,6 +56,8 @@ func (b *Buffer) Bytes() []byte { return b.buf[b.off:] }
 
 // String returns the contents of the unread portion of the buffer
 // as a string. If the Buffer is a nil pointer, it returns "<nil>".
+//
+// To build strings more efficiently, see the strings.Builder type.
 func (b *Buffer) String() string {
        if b == nil {
                // Special case, useful in debugging.