Define functions as methods of custom types

hello/main.go

@@ -5,5 +5,35 @@ import (
 )
 
 func main() {
-	fmt.Println("Hello from Go!")
+	fmt.Println("Define functions as methods of custom types")
+	poodle := Dog{"Poodle", 10, "woof!"}
+	fmt.Println(poodle)
+	fmt.Printf("%v\n", poodle)
+	fmt.Printf("Breed : %v\nweight : %v\n", poodle.Breed, poodle.weight)
+	poodle.weight = 9
+	fmt.Printf("Breed : %v\nweight : %v\n", poodle.Breed, poodle.weight)
+
+	poodle.Speak()
+	poodle.sound = "Arf !"
+	poodle.Speak()
+	poodle.SpeakThreeTimes()
+}
+
+// Dog in an explort struct
+type Dog struct {
+	Breed  string
+	weight int
+	sound  string
+}
+
+// exported fumction as method with upper case caracter in the name
+func (d Dog) Speak() {
+	fmt.Println(d.sound)
+}
+
+func (d Dog) SpeakThreeTimes() {
+	d.sound = fmt.Sprintf("%v %v %v", d.sound, d.sound, d.sound)
+	fmt.Println(d.sound)
 }
+//The ability to create custom methods for your own types,
+// makes Go behave more like a fully Object Oriented language.