Variadic Functions

• A variadic function is one that can be called with varying numbers of arguments.
• The most familiar examples are fmt.Printf and its variants.
• Printf requires one fixed argument at the beginning, then accepts any number of subsequent arguments
• To create a variadic function, the type of the final parameter is preceded by an ellipsis, "..."
  • This indicates that the function may be called with any number of arguments of this type.

func sum(vals ...int) int {
    total := 0
    for _, val := range vals {
        total += val
    }
    return total
}

values := []int{1, 2, 3, 4}
fmt.Println(sum(values...)) // "10"

Notice here the ... after the parameter vals and notice the ... after values in the caller Think of this like a spread operator which spreads all the arguments of a list

Variadic Functions Playground