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A comment on Why Functional Programming Matters (1984) [pdf]. Parent comment

Re:Why Functional Programming Matters (1984) [pdf] by marcosdumay on Thursday December 08, 2016 @11:56AM (#13131733)
Anything that needs rewriting a memory address without losing time by allocation and garbage collection.

Handling IO exceptions and masking them as different errors.

Thread, process, or machine coordination in parallel execution.

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Re:Why Functional Programming Matters (1984) [pdf] by pka on Thursday December 08, 2016 @03:21PM (#13133909)
You don't need unsafePerformIO for any of these.

> Anything that needs rewriting a memory address without losing time by allocation and garbage collection.

ST gives you mutable references. Or just use IO.

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Re:Why Functional Programming Matters (1984) [pdf] by marcosdumay on Thursday December 08, 2016 @07:03PM (#13135544)
You need it for doing what the OP is talking about.
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