Can Go functions specify a particular array length?

Question

Does Go allow functions to add array length constraints to the signature, or would length still require a runtime check?

Answer 1

For arrays it is more than possible, it is required. For slices it is impossible.

package main

import (
    "fmt"
)

func main() {
    d := [2]int{1, 2}
    fmt.Println(sum(d))
}

func sum(data [2]int) int {
    return data[0] + data[1]
}

https://play.golang.org/p/-VMxyDvwUt