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deferFunctor - helper for defining defer #42

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deferFunctor - helper for defining defer #42

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6 changes: 5 additions & 1 deletion src/Control/Lazy.purs
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
module Control.Lazy where

import Data.Unit (Unit)
import Prelude

-- | The `Lazy` class represents types which allow evaluation of values
-- | to be _deferred_.
Expand All @@ -10,6 +10,10 @@ import Data.Unit (Unit)
class Lazy l where
defer :: (Unit -> l) -> l

-- | `deferFunctor` can be used to define a trivial `defer` for any Functor
deferFunctor :: forall l a. Functor l => Lazy a => (Unit -> l a) -> l a
deferFunctor f = ((map (defer <<< const)) <$> f) unit

-- | `fix` defines a value as the fixed point of a function.
-- |
-- | The `Lazy` instance allows us to generate the result lazily.
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