Hi,

Am Dienstag, 12. Juni 2012 12:10:08 UTC+2 schrieb Chris Ford:
>
> While first and next need to be supported to make maps and sets sequable, 
> I don't think that conceptually the elements are ordered.


Take care! Neither maps nor sets (nor vectors for that matter) support 
first and next! These are sequence functions! They only work on sequences. 
The fact that you can pass in maps, sets or vectors is due to the fact that 
first and next are nice and call seq on the argument on your behalf so that 
you don't have to. But that doesn't mean, that the map itself supports 
first or next.

Neither maps nor sets are sequential data structures. So nth doesn't make 
much sense to work with them. I'm not sure about the sorted variants. 

Kind regards
Meikel

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