Struct method aka Reciever function in Go

Object Oriented Programming is a little different in Go. Instead of class, Go has struct which is like an object.

Create a struct #

First you create a struct object like this:

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type Person struct {
    name string
    age  int
}

Declaring struct method #

Then, you pass the struct in a function like this:

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func (p *Person) addInfo(name string, age int) {
    p.name = name
    p.age = age
}

Finally, calling the method using the struct #

Then you can call the function using the struct as a reciever like this:

func main() {
    p = Person{}    
    fmt.Println(p) // output: { 0}
    p.addInfo("Wai Yan", 27)    
    fmt.Println(p) // output: {Wai Yan 27}
}

Why use reciever function? #

The function can only be called using dot operator with p struct which is in a way an object.