CODEWITHSUNDEEP
functional-programminghigher-order-functions
J. Abrahamson
J. Abrahamson

Reputation: 74384

What's the highest order function used in practice?

For instance, mask in Haskell is of type (((forall a . IO a -> IO a) -> IO b) -> IO b). What is the purpose of such a function? Any language with a notion of a higher-order function is welcome.

For purposes of exactness, include only functions which are defined in public libraries or in use in live code.

Upvotes: 5

Views: 389

Answers (1)

ja.
ja.

Reputation: 4249

Okasaki exhibits a 6th order function: Even Higher-Order Functions for Parsing or Why Would Anyone Ever Want To Use a Sixth-Order Function?

Upvotes: 14

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