Example using triple dots (variadic parameter) in Golang

threedots.go

package main

import "fmt"

// If function want to take any dtype, use interface{}. We can iterate it using for range
func threeDotsInterface(a ...interface{}) {
  for k, v := range a {
    fmt.Println("Key ", k, " Value ", v)
  }
}

// Same as above, but only apply for interface{}
func squareBracketInterface(a []interface{}) {
  for k, v := range a {
    fmt.Println("Key ", k, " Value ", v)
  }
}

func threeDotsStr(a ...string) {
  for k, v := range a {
    fmt.Println("Key ", k, " Value ", v)
  }
}
// ...string can be replaced with ...interface{} for more flexible input
func mixThreeDots(a, b int, c ...string) {
  fmt.Println("Sum of two int: ", a + b)
  for k, v := range c {
    fmt.Println("Key ", k, " Value ", v)
  }
}

func main() {
  threeDotsInterface(1, 2.5, "foo", []int{2,3}, false)
  squareBracketInterface([]interface{}{1, 2.5, "foo", []int{2,3}, false})
  threeDotsStr("foo", "baar", "another foo")
  mixThreeDots(3, 4, "another", "string", "for", "the", "test")
}