strings: Add IndexFunc example

R=golang-dev, bradfitz CC=golang-dev https://golang.org/cl/42370043

strings: Add IndexFunc example
R=golang-dev, bradfitz CC=golang-dev https://golang.org/cl/42370043
ab9b2ae3 · Robin Eklind · Brad Fitzpatrick · 7b53e32e · ab9b2ae3
Commit ab9b2ae3 authored Dec 16, 2013 by Robin Eklind Committed by Brad Fitzpatrick Dec 16, 2013
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example_test.go src/pkg/strings/example_test.go +11 -0

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--- a/src/pkg/strings/example_test.go
+++ b/src/pkg/strings/example_test.go
@@ -68,6 +68,17 @@ func ExampleIndex() {
 	// -1
 }

+func ExampleIndexFunc() {
+	f := func(c rune) bool {
+		return unicode.Is(unicode.Han, c)
+	}
+	fmt.Println(strings.IndexFunc("Hello, 世界", f))
+	fmt.Println(strings.IndexFunc("Hello, world", f))
+	// Output:
+	// 7
+	// -1
+}
+
 func ExampleIndexRune() {
 	fmt.Println(strings.IndexRune("chicken", 'k'))
 	fmt.Println(strings.IndexRune("chicken", 'd'))