> > IO(U)Arrays are only one variant of mutable Array, there are also > ST(U)Arrays, > which are often preferred. >
I should have worded my question better. The MArray interface is implemented in both the ST and IO monad. A state monad seems like a logical place for mutable arrays. However, I don't understand the motivation for implementing it in IO. Were mutable arrays added to IO because it would be difficult to write code that does both IO and manipulates arrays otherwise?
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