Go - Methods - Pointer Receiver

• Declare Method
  
• Method and Function can be the same name
  
• Method and Field can not have the same name
  
• Can declare another method name in the same file for different type
  
• To modify instance value directly, use pointer to declare Method
  
• Pointer type can't be declared as method receiver.
  
• When a receiver is declared as a pointer, client code should use & to call method.
  But Go will convert it implicitly
  
• Can not call method in *Point because no address if temp value. Ex. Point{}.add(2)//compile error
  
• Ways to declare and use receiver