[Haskell-cafe] Vector-like data structure

[Don Stewart]

gtener:
> Hi
> 
> I'm looking for a data structure with following characteristics:
> 1. O(1) lookup
> 2. O(1) modification
> 3. amortized O(1) append
> 4. O(1) size query
> 
> This roughly characterizes C++ vector<> class. I'm ready to implement
> it myself, but first I would like to ask if anyone knows package with
> similar data structure.
> If there are many, which one would you choose and why?
> 

A number of the array packages behave like this.  The trie packages are
O(log(wordsize)), so another option (they tend to have better append
complexity as well).

-- Don