Any difference in using an empty interface or an empty struct as a map's value?

Question

I am using this construct to simulate a set

type MyType uint8
map[MyType]interface{}

I then add in all my keys and map them to nil

Answer 1

I would like to add additional detail about empty struct , as differences are already covered by andybalholm and peterSO .

Below is the example which shows usability of empty struct .

Creates an instance of rectangle struct by using a pointer address operator is denoted by & symbol.

package main

import "fmt"

type rectangle struct {
    length  int
    breadth int
    color   string
}

func main() {
    var rect1 = &rectangle{10, 20, "Green"} // Can't skip any value
    fmt.Println(rect1)

    var rect2 = &rectangle{}
    rect2.length = 10
    rect2.color = "Red"
    fmt.Println(rect2) // breadth skipped

    var rect3 = &rectangle{}
    (*rect3).breadth = 10
    (*rect3).color = "Blue"
    fmt.Println(rect3) // length skipped
}

Reference : https://www.golangprograms.com/go-language/struct.html

For a thorough read you can refer : https://dave.cheney.net/2014/03/25/the-empty-struct