Re: [tlug] Are ordered hashes useful?

[Simon Cozens <simon@example.com>]

On 14/02/2011 03:20, Stephen J. Turnbull wrote:
> But most of the examples you give there (eg, histogram) are really
> special cases of dictionary.

No, I don't think so, and this is the point. Dictionaries define a 
transformation between list A and list B. If you want to be pedantic, then 
formally, yes, a histogram is a case of a dictionary. But in terms of how it's 
being used, there isn't a second data structure B - it's just telling you 
properties about list A. What we often think of as mapping between two lists 
is more often asking questions about the structure of one list.