range methods on associative arrays

[Steven Schveighoffer]

On 7/2/22 4:14 PM, WebFreak001 wrote:
> a lot of range methods, such as `filter`, `any`, `all`, `count`, `each`, 
> etc. would be useful on associative arrays, taking in key and value, 
> returning a processed .byKeyValue range.
> 
> I would suggest, at least for phobos v2, we should have these functions 
> automatically call `.byKeyValue` on maps and there should be support for 
> lambdas with 2 arguments there, which automatically unwrap key and value 
> (and possibly all tuples actually)
> 
> What do you think?
> 
> ```d
> map.each!((key, value) { /* like a foreach, but functional style */ });
> 
> bool hasId = map.any!((key, value) => key == "id" && value !is null);
> ```
> 
> for this I think the implementation would basically boil down to:
> 
> - implicitly call `.byKeyValue` in the map-accepting range methods
> - allow tuples and the KeyValue pair to be extended into multiple 
> parameters on CT lambdas that have multiple arguments
> 
> Users wanting to only use keys or only values can still use .byKey or 
> .byValue.

This idea misunderstands what a range is.

In order for an AA to be considered a "range", each popFront should 
remove the element from the AA.

We don't want that. Just use the range accessors.

-Steve