How to create heterogeneous arrays in Go / golang.

heterogeneous-array.go

/*
 * Example of heterogeneous arrayo in golang.
 *
 * The trick is simply to create an array that accepts elements that conform
 * to the naked interface (an interface with no requirements).
 *
 * Expected output:
 *
 * $ go run array.go
 * [1 2 3.14 hey {10 20}]
 *
 */
package main

import "fmt"

type foo struct {
  a int
  b int
}

func main() {
  a := []interface{}{1, 2, 3.14, "hey", foo{10, 20}}
  fmt.Println(a)
}

And with Go 1.18+, you get the much nicer any type instead of interface{}, making this simple example even simpler.