Category:Monads: Difference between revisions
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Functions of this type can not be directly nested with each other, because their output type (wrapped) does not match their input type (raw and unwrapped). |
Functions of this type can not be directly nested with each other, because their output type (wrapped) does not match their input type (raw and unwrapped). |
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The monad pattern consists of writing two higher-order functions which solve this problem, allowing the programmer to easily nest the application of such functions, by abstracting out the mechanics, and making sure that a function does not choke on an unexpected input type (a wrapped type, when it was |
The monad pattern consists of writing two higher-order functions which solve this problem, allowing the programmer to easily nest the application of such functions, by abstracting out the mechanics, and making sure that a function does not choke on an unexpected input type (a wrapped type, when it was expecting a raw type). |
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More specifically, the two higher-order functions of the monad pattern handle the details of: 1. wrapping data in a particular kind of envelope, and 2. Providing other functions with direct access to the contents of an enclosing envelope. |
More specifically, the two higher-order functions of the monad pattern handle the details of: 1. wrapping data in a particular kind of envelope, and 2. Providing other functions with direct access to the contents of an enclosing envelope. |
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