monad
3
9.9
- noun
- /ˈmɒnæd/
- Specialized
:
mónada
- Using a monad can simplify complex operations by providing a structured way to handle data transformations.
Examples
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The Haskell IO Monad could be regarded as a case of trying to force incompatible paradigms together.
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The starting point for me was the realization that in Haskell, pure code (outside of the IO monad) may raise an exception, and, importantly for my point, the exceptions are user-defined.
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One reason is that doing them properly puts exception allocation into the IO monad.
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If you don't know what a monad is, in Scala, it is something that has the map and flatMap methods.
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In this way, we use Future almost like an IO monad (see this post for an introduction to functional IO).
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There are languages I dabble in but don't know well (JavaScript), and there are ideas that I barely understand (monads).
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In functional programming, a monad helps manage side effects by wrapping values in a context.
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The promise monad allows asynchronous computations to be written in a more readable manner.
Surface Forms
Etymology
Monad comes from the Greek words monas and monos, which mean 'single' or 'one'. So in programming a monad is a pattern that puts data and actions into one organized unit to keep code behaviour clear and predictable.