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Add useStateConst where update is always const #24

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Merged
maddie927 merged 2 commits into from
Apr 29, 2020
Merged

Add useStateConst where update is always const #24

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6d684f0
Add a variant of useState where update is always const
jvliwanag Apr 25, 2020
3e8b10d
Rename useStateConst to useState'
jvliwanag Apr 28, 2020
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9 changes: 9 additions & 0 deletions src/React/Basic/Hooks.purs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@ module React.Basic.Hooks
, ReactChildren
, memo
, useState
, useState'
, UseState
, useEffect
, useEffectOnce
Expand Down Expand Up @@ -39,6 +40,7 @@ module React.Basic.Hooks
) where

import Prelude hiding (bind, discard)
import Data.Bifunctor (rmap)
import Data.Function.Uncurried (Fn2, mkFn2)
import Data.Maybe (Maybe)
import Data.Newtype (class Newtype)
Expand Down Expand Up @@ -165,6 +167,13 @@ useState initialState =
unsafeHook do
runEffectFn2 useState_ (mkFn2 Tuple) initialState

useState' ::
forall state.
state ->
Hook (UseState state) (state /\ (state -> Effect Unit))
useState' initialState =
useState initialState <#> rmap (_ <<< const)

foreign import data UseState :: Type -> Type -> Type

-- | Runs the given effect when the component is mounted and any time the given
Expand Down