Its often that I see people refer to go syntax as “simple” I hardly find it so. I chronically forget some of Go’s basic syntax. Specifically recently I had to look up what the
... operator is. It seems that the ... operator is for specifying the inputs to “Variadic” functions. Wikipedia tells me that a variadic funcion is a function of indefinite arity, i.e., one which accepts a variable number of arguments

Go figure.

Go By Example has this pretty well authored here, I’ve copy-pasta-ed it below:

package main

import "fmt"

func sum(nums ...int) {
    fmt.Print(nums, " ")
    total := 0
    for _, num := range nums {
        total += num
    }
    fmt.Println(total)
}

func main() {

    sum(1, 2)
    sum(1, 2, 3)

    nums := []int{1, 2, 3, 4}
    sum(nums...)
}

Note the ... is before the type on the function argument definition and when the function is called with a slice arguement the ... follows the slice.

I’m not sure how smartly you can mix this variadic input, for example does the variadic argument need to be last? Can I have more then one variadic input type? IDK. Researching that another day.