Variadic functions

Context

Variadic functions accept a variable number of arguments. The last parameter is declared with ...T, and inside the function it behaves as a slice of type []T.

Example

Write a variadic function that sums any number of integers.

Code example

package main

import "fmt"

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

func main() {
    fmt.Println(sum(1, 2, 3))
    fmt.Println(sum(4, 5, 6, 7))

    // Passing a slice to a variadic function
    nums := []int{10, 20, 30}
    fmt.Println(sum(nums...))
}

Output

6
22
60

Useful links

• Go by Example: Variadic Functions
• Go spec: Function types (variadic)