What are methods on structs in Go?

What are methods on structs in Go?

In Go, methods are functions that are associated with a specific type, like a struct. They allow you to define behavior for your structs.

Can you give me an example of a method on a struct?

Sure! Here's a simple example:

package main

import "fmt"

type Rectangle struct {
    Width  float64
    Height float64
}

func (r Rectangle) Area() float64 {
    return r.Width * r.Height
}
}

func main() {
    rect := Rectangle{Width: 10, Height: 5}
    fmt.Println("Area of rectangle:", rect.Area())
}

What does the Area method do in this example?

The Area method calculates and returns the area of the rectangle by multiplying its width and height.

Can methods modify the struct's fields?

Yes, if you define the method with a pointer receiver, it can modify the struct's fields. For example:

func (r *Rectangle) Scale(factor float64) {
    r.Width *= factor
    r.Height *= factor
}