By bloid
via intoverflow.wordpress.com
Published: Sep 04 2007 / 12:31
After learning Haskell, I became fascinated by the idea of using monads to express security-related ideas in software. The idea is pretty simple: one can think of the IO monad as a type system contaminate that identifies all functions that interact with the program’s environment (such as those that print to the console, write to the network, etc). This is useful: a function cannot mutate the environment unless it has IO type. Contrast this with most languages (C++, Java, Scheme, Python, etc) where you need to examine a function’s implementation to be sure that it doesn’t mess with the environment.
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