update book code

eBook/examples/chapter_10/method_on_time.go

@@ -0,0 +1,25 @@
+// method_on_time.go
+package main
+
+import (
+	"fmt"
+    "time"
+)
+
+type myTime struct {
+    time.Time //anonymous field
+}
+
+func (t myTime) first3Chars() string {
+    return t.Time.String()[0:3]
+}
+
+func main() {
+    m := myTime{time.Now()} 
+    fmt.Println("Full time now:", m.String()) //calling existing String method on anonymous Time field
+    fmt.Println("First 3 chars:", m.first3Chars()) //calling myTime.first3Chars
+}
+/* Output:
+Full time now: Mon Oct 24 15:34:54 Romance Daylight Time 2011
+First 3 chars: Mon
+*/