[Haskell-cafe] Mutable data design question

[Robert Dockins]

I imagine you would want to use a truly mutable data structure in the IO 
monad -- something like an STUArray of Chars.

GoldPython wrote:

> In the case of writing something like a text editor where the data
> involved is by its very nature mutable, what sort of design paradigm
> would you use in a functional language?
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