Skip to content

Add useStateConst where update is always const #24

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 2 commits into from
Apr 29, 2020
Merged

Add useStateConst where update is always const #24

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
6d684f0
Add a variant of useState where update is always const
jvliwanag Apr 25, 2020
3e8b10d
Rename useStateConst to useState'
jvliwanag Apr 28, 2020
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
9 changes: 9 additions & 0 deletions src/React/Basic/Hooks.purs
View file
Open in desktop
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