AA.remove in foreach && AA = new vs cleaning

[Saaa]

Saaa wrote:
> Steven Schveighoffer wrote
>
>>> But I've changed everything to `new` the array afterwards as I deleted 
>>> all  the
>>> keys anyways.
>>
>> Not sure what you mean here.
>
> foreach (K k, ; aa)
> {
>  ..
>  //aa.remove(k);
> }
> aa = new int[char];

Error: new can only create structs, dynamic arrays or class objects

So, what is the fastest way to clean an AA?