1 files changed, 36 insertions, 0 deletions
diff --git a/content/slices/prog140.go b/content/slices/prog140.go
new file mode 100644
index 0000000..306d6f2
--- /dev/null
+++ b/content/slices/prog140.go
@@ -0,0 +1,36 @@
+// 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"
+)
+
+// Append appends the elements to the slice.
+// Efficient version.
+func Append(slice []int, elements ...int) []int {
+	total := len(slice) + len(items)
+	if total > cap(slice) {
+		// Reallocate. Grow to 1.5 times the new size, so we can still grow.
+		newSize := total*3/2 + 1
+		newSlice := make([]int, total, newSize)
+		copy(newSlice, slice)
+		slice = newSlice
+	}
+	n := len(slice)
+	slice = slice[:total]
+	copy(slice[:n], elements)
+	return slice
+}
+
+func main() {
+	// START OMIT
+	slice1 := []int{0, 1, 2, 3, 4}
+	slice2 := []int{55, 66, 77}
+	fmt.Println(slice1)
+	slice1 = Append(slice1, slice2...) // The '...' is essential!
+	fmt.Println(slice1)
+	// END OMIT
+}