Variadic Functions & Closures

Sometimes you don’t know how many arguments you’ll get — a party might have one hero or six. A variadic function accepts any number of them using ...:

func shout(words ...string) {
    for _, w := range words {
        fmt.Println(w)
    }
}
shout("for", "the", "realm")

Inside the function, the variadic parameter is just a slice.

Functions are also values in Go, and a closure is a function that captures variables from around it — handy for counters and generators:

func counter() func() int {
    n := 0
    return func() int { n++; return n }
}
next := counter()
fmt.Println(next(), next()) // 1 2

##Your Quest

Write a variadic function total that takes any number of ints and returns their sum.

Expected output:

60

##Hint

Declare func total(nums ...int) int, then for _, n := range nums { sum += n } and return sum.

##Additional Scrolls of Wisdom

• Go Variadic Function Tutorial
• Go Closures Tutorial