Add Scan example. Fixes redis#149.

example_test.go

@@ -109,6 +109,34 @@ func ExampleClient_Incr() {
 	// Output: 1 <nil>
 }
 
+func ExampleClient_Scan() {
+	client.FlushDb()
+	for i := 0; i < 33; i++ {
+		err := client.Set(fmt.Sprintf("key%d", i), "value", 0).Err()
+		if err != nil {
+			panic(err)
+		}
+	}
+
+	var cursor int64
+	var n int
+	for {
+		var keys []string
+		var err error
+		cursor, keys, err = client.Scan(cursor, "", 10).Result()
+		if err != nil {
+			panic(err)
+		}
+		n += len(keys)
+		if cursor == 0 {
+			break
+		}
+	}
+
+	fmt.Printf("found %d keys\n", n)
+	// Output: found 33 keys
+}
+
 func ExampleClient_Pipelined() {
 	var incr *redis.IntCmd
 	_, err := client.Pipelined(func(pipe *redis.Pipeline) error {