Unable to create array of set length

[sinzin91]

Trying to create an array of length 3:

[1] go-pry> var z [3]int
=> <nil>
[2] go-pry> z
=> []int(nil)
[3] go-pry> z[0]
Error:  slice index out of range <nil>

Works in gore:

gore> var z [3]int
gore> z
[3]int{
  0,
  0,
  0,
}
gore> z[0]
0

[d4l3k]

I investigated this and it's an interesting problem. Doesn't seem like there's a way to create actual [3]int types using reflection which is why this is happening. We can only make []int types which then lose some information when passed into make(). Guess we need some way of tracking extra data on types.

[cosmos72]

implementing something like this should suffice to create an actual array (not a slice) with reflection:

import "reflect"

func createArrayOfT(length int, elementType reflect.Type) reflect.Value {
  return reflect.New(reflect.ArrayOf(length, elementType)).Elem()
}

[d4l3k]

Cool, thanks for letting me know about that! I just created a PR with proper support for fixed length arrays.