From cd242fb48063685ab3f48661c265bfb661bdc3d9 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@golang.org>
Date: Tue, 13 Apr 2010 13:05:29 -0700
Subject: [PATCH] Use the copy function rather than a loop.

R=r
CC=golang-dev
https://golang.org/cl/882047
---
 doc/effective_go.html | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/doc/effective_go.html b/doc/effective_go.html
index ce5fcb99d5b..415ae09626c 100644
--- a/doc/effective_go.html
+++ b/doc/effective_go.html
@@ -1070,10 +1070,8 @@ func Append(slice, data[]byte) []byte {
     if l + len(data) &gt; cap(slice) {  // reallocate
         // Allocate double what's needed, for future growth.
         newSlice := make([]byte, (l+len(data))*2)
-        // Copy data (could use bytes.Copy()).
-        for i, c := range slice {
-            newSlice[i] = c
-        }
+        // The copy function is predeclared and works for any slice type.
+        copy(newSlice, slice)
         slice = newSlice
     }
     slice = slice[0:l+len(data)]