how to sort the container Array from std.container

[Flaze07]

On Wednesday, 6 June 2018 at 13:46:41 UTC, Adam D. Ruppe wrote:
> On Wednesday, 6 June 2018 at 13:44:09 UTC, Flaze07 wrote:
>> sort( arr.Range );
>> don't work, it says cannot pass RangeT!(Array!uint) as 
>> function argument
>
> Range is the type, you want the value
>
> I think you can do
>
> sort(arr[])
>
> maybe

I see why it works, so, [] is called slice operator right ?
and in 
https://dlang.org/phobos/std_container_array.html#.Array.opSlice 
it returns range, so that's why it worked