Comments (4)
@justingrant The way unstate-next suggests is a pure React way: Create multiple contexts. I don't think they have multiple values inside a single context. Where do you find that description?
Even if there is a library that keeps several values in multiple/single context, there's a use case where selector works better. Selector interface is very powerful, and it can do something like this:
const isYoung = useContextSelector(ctx, s => s.person.age < 10); // it won't trigger a re-render if `age` is changed from `5` to `6`.
from use-context-selector.
@dai-shi - I was thinking of the way that you can put multiple methods and/or properties into an unstated-next Container
. Like this:
function useCoordinates() {
const [x, setX] = useState(0);
const [y, setY] = useState(0);
const getRadius = useCallback(() => Math.sqrt(x*x + y*y),
[x, y]
);
const setCoordinates = useCallback((newX, newY) => {
setX(newX);
setY(newY);
}, [x, y]);
return ({
x,
setX,
y,
setY,
setCoordinates,
getRadius,
});
}
export const FooContainer = createContainer(useFoo);
But I think I also see what you mean, because in my example above there's not a good way to say "only re-render if x
changes but not if y
changes. Is that the essence of the difference that you mean?
from use-context-selector.
@justingrant Yes, in your example, if x
changes and y
doesn't change, a component that only use y
will also re-render.
useContextSelector
solves it with a proper selector.
useTrackedState
in react-tracked solves it without any selector.
I can create some examples if you like.
from use-context-selector.
Closing this. Feel free to re-open it for further discussion.
from use-context-selector.
Related Issues (20)
- broken in react 18 HOT 7
- trigger other rerender use official demo
- Is it possible to create a strict context with this library? HOT 8
- [question] unexpected component render when first set different state HOT 4
- [question] Why is the scheduler dependency required? HOT 5
- Difference between this package and `@fluentui/react-context-selector` HOT 1
- Can you review my hook? (useKeyedContextSelector) HOT 2
- Don't work with react 18.2 HOT 10
- React Native: Crash occurs when using `createContext` and `MyContext.Provider` after updating to react-native v0.72 or later HOT 7
- Update occurs asynchronously after selection function runs HOT 1
- Version 1.4.2 specifies main module field that cannot be resolved HOT 16
- useMemo vs useContextSelector HOT 1
- Issue is back, missing some kind of export for react native. HOT 5
- react18 respond
- FATAL ERROR: MarkCompactCollector: young object promotion failed Allocation failed - JavaScript heap out of memory HOT 8
- Context.Provider as HOC with memoized children - children still rerender on any state change HOT 5
- [Question] Getting several context values at once? HOT 7
- "useContextSelector requires special context" warning is never printed HOT 3
- `yarn compile` fails HOT 1
- The component doesn't redraw, but the component function is still executed HOT 8
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from use-context-selector.