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module Test.QuickCheck.Instances.
Maybe No documentation available.
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foundation Foundation The Maybe type encapsulates an optional value. A value of type Maybe a either contains a value of type a (represented as Just a), or it is empty (represented as Nothing). Using Maybe is a good way to deal with errors or exceptional cases without resorting to drastic measures such as error. The Maybe type is also a monad. It is a simple kind of error monad, where all errors are represented by Nothing. A richer error monad can be built using the Either type.
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prelude-compat Prelude2010 The Maybe type encapsulates an optional value. A value of type Maybe a either contains a value of type a (represented as Just a), or it is empty (represented as Nothing). Using Maybe is a good way to deal with errors or exceptional cases without resorting to drastic measures such as error. The Maybe type is also a monad. It is a simple kind of error monad, where all errors are represented by Nothing. A richer error monad can be built using the Either type.
module Rebase.Control.Monad.Trans.
Maybe No documentation available.
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No documentation available.
module Data.Automaton.Trans.
Maybe An Automaton with Maybe or MaybeT in its monad stack can terminate execution at any step.
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base-prelude BasePrelude.DataTypes The Maybe type encapsulates an optional value. A value of type Maybe a either contains a value of type a (represented as Just a), or it is empty (represented as Nothing). Using Maybe is a good way to deal with errors or exceptional cases without resorting to drastic measures such as error. The Maybe type is also a monad. It is a simple kind of error monad, where all errors are represented by Nothing. A richer error monad can be built using the Either type.
module Control.Carrier.Empty.
Maybe A carrier for an Empty effect, indicating failure with a Nothing value. Users that need access to an error message should use the Fail effect. Note that Empty effects can, when they are the last effect in a stack, be interpreted directly to a Maybe without a call to runEmpty.
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mixed-types-num Numeric.MixedTypes.PreludeHiding The Maybe type encapsulates an optional value. A value of type Maybe a either contains a value of type a (represented as Just a), or it is empty (represented as Nothing). Using Maybe is a good way to deal with errors or exceptional cases without resorting to drastic measures such as error. The Maybe type is also a monad. It is a simple kind of error monad, where all errors are represented by Nothing. A richer error monad can be built using the Either type.
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relational-query Database.Relational.SqlSyntax No documentation available.