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use-value-enhancer
Advanced tools
React hooks for value-enhancer.
npm add use-value-enhancer value-enhancer react
useVal
accepts a val from anywhere and returns the latest value.
It triggers re-rendering when new value emitted from val (base on val $version
instead of React's Object.is
comparison).
import { val } from "value-enhancer";
import { useVal } from "use-value-enhancer";
const val$ = val("value");
function Component({ val$ }) {
const value = useVal(val$);
return <p>{value}</p>;
}
useDerived
accepts a val from anywhere and returns the latest derived value.
Re-rendering is triggered when the derived value changes.
import { val } from "value-enhancer";
import { useDerived } from "use-value-enhancer";
const val$ = val("1");
function Component({ val$ }) {
const derived = useDerived(val$, value => Number(value));
return <p>{derived}</p>;
}
useFlatten
accepts a val from anywhere and returns the latest value from the flatten val.
Re-rendering is triggered when the flatten value changes.
import { val } from "value-enhancer";
import { useFlatten } from "use-value-enhancer";
const val$ = val(val("1"));
function Component({ val$ }) {
const value = useFlatten(val$); // "1"
return <p>{value}</p>;
}
import { val } from "value-enhancer";
import { reactiveMap } from "value-enhancer/collections";
import { useFlatten } from "use-value-enhancer";
const map = reactiveMap();
map.set("a", val("1"));
function Component({ map }) {
const value = useFlatten(map.$, map => map.get("a")); // "1"
return <p>{value}</p>;
}
useKeys
accepts a reactive collection and returns the latest keys()
as array.
import { reactiveMap } from "value-enhancer/collections";
import { useKeys } from "use-value-enhancer";
const map = reactiveMap();
function Component({ map }) {
const keys = useKeys(map);
return keys.map(key => <p key={key}>{key}</p>);
}
useValues
accepts a reactive collection and returns the latest values()
as array.
import { reactiveSet } from "value-enhancer/collections";
import { useValues } from "use-value-enhancer";
const set = reactiveSet();
function Component({ set }) {
const values = useValues(set);
return values.map(value => <p key={String(value)}>{value}</p>);
}
import React, { createContext, useContext } from "react";
import ReactDOM from "react-dom/client";
import { val } from "value-enhancer";
import { useVal } from "use-value-enhancer";
const valFromProps$ = val("Props");
const valFromContext$ = val("Context");
const valFromExternal = val("External");
const ValContext = createContext(valFromContext$);
export const App = ({ valFromProps$ }) => {
const valFromProps = useVal(valFromProps$);
const valFromContext$ = useContext(ValContext);
const valFromContext = useVal(valFromContext$);
const valFromExternal = useVal(valFromExternal$);
return (
<>
<p>
{valFromProps}, {valFromContext}, {valFromExternal}
</p>
<p>Props, Context, External</p>
</>
);
};
ReactDOM.createRoot(document.getElementById("root")).render(
<ValContext.Provider value={valFromContext$}>
<App valFromProps$={valFromProps$} />
</ValContext.Provider>
);
FAQs
React hooks for value-enhancer.
The npm package use-value-enhancer receives a total of 94 weekly downloads. As such, use-value-enhancer popularity was classified as not popular.
We found that use-value-enhancer demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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