go.blog/slices: first draft of slices blog post

It's an exposition of append.
Still pretty rough but the programs run.

Fixes golang/go#4055.

R=golang-dev, adg, dan.kortschak, 0xjnml, mirtchovski, bradfitz
CC=golang-dev
https://golang.org/cl/13899043

1 files changed, 25 insertions, 0 deletions

diff --git a/content/slices/prog050.go b/content/slices/prog050.go
new file mode 100644
index 0000000..b5e77b4
--- /dev/null
+++ b/content/slices/prog050.go
@@ -0,0 +1,25 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"fmt"
+)
+
+type path []byte
+
+func (p path) ToUpper() {
+	for i, b := range p {
+		if 'a' <= b && b <= 'z' {
+			p[i] = b + 'A' - 'a'
+		}
+	}
+}
+
+func main() {
+	pathName := path("/usr/bin/tso")
+	pathName.ToUpper()
+	fmt.Printf("%s\n", pathName)
+}