The Go Programming Language

5.7 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 declare a variadic function, the type of the final parameter is preceded by an ellipsis, “...”, which indicates that the function may be called with any number of arguments of this type.

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gopl.io/ch5/sum

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

The sum function above returns the sum of zero or more int arguments. Within the body of the function, the type of vals is an []int slice. When