[Haskell-cafe] Hash table constructors return table in IO Monad. Why?

[Bryan O'Sullivan]

On Thu, May 12, 2011 at 9:22 AM, Stephen Tetley <stephen.tetley at gmail.com>wrote:

> The hashtable needs to be been created in IO, after that, think of the
> 'hashtable' as a analogous to a file handle. You have to pass it
> around to do anything with it - but the only things you can do with it
> are in IO.
>

The appropriate pure package to be using instead is unordered-containers.
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