On Thu, Mar 7, 2019 at 8:31 AM <halbert.coll...@gmail.com> wrote:
>
> Hi.
>
> The code like below:
>
> package main
>
> import "fmt"
>
> func main() {
> primes := [6]int{2, 3, 5, 7, 11, 13}
> fmt.Println(primes[6:6]) . // OK. return: []
> //fmt.Println(primes[6]) . // fail. out of bounds...
> }
>
> Why?
Those two expressions are doing different things:
primes[6:6] is a slice that begins after the last element of primes,
with len=0. You can, for instance, add a new element to primes[6:6],
which makes a new slice with one element. primes[6:7], for instance,
would be an error,
primes[6] is an int, accessing the element beyond array bounds, so it
is an error.
>
> Is the golang grammatical feature? or anything else..
>
> Any help, please!
>
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