47 lines
1.2 KiB
Markdown
47 lines
1.2 KiB
Markdown
---
|
|
title: React useGetSet hook
|
|
tags: hooks,state
|
|
author: chalarangelo
|
|
cover: interior-12
|
|
firstSeen: 2021-10-27T05:00:00-04:00
|
|
---
|
|
|
|
Creates a stateful value, returning a getter and a setter function.
|
|
|
|
- Use the `useRef()` hook to create a ref that holds the stateful value, initializing it with `initialState`.
|
|
- Use the `useReducer()` hook that creates a new object every time it's updated and return its dispatch.
|
|
- Use the `useMemo()` hook to memoize a pair of functions. The first one will return the current value of the `state` ref and the second one will update it and force a re-render.
|
|
|
|
```jsx
|
|
const useGetSet = initialState => {
|
|
const state = React.useRef(initialState);
|
|
const [, update] = React.useReducer(() => ({}));
|
|
|
|
return React.useMemo(
|
|
() => [
|
|
() => state.current,
|
|
newState => {
|
|
state.current = newState;
|
|
update();
|
|
},
|
|
],
|
|
[]
|
|
);
|
|
};
|
|
```
|
|
|
|
```jsx
|
|
const Counter = () => {
|
|
const [getCount, setCount] = useGetSet(0);
|
|
const onClick = () => {
|
|
setTimeout(() => {
|
|
setCount(getCount() + 1);
|
|
}, 1_000);
|
|
};
|
|
|
|
return <button onClick={onClick}>Count: {getCount()}</button>;
|
|
};
|
|
|
|
ReactDOM.render(<Counter />, document.getElementById('root'));
|
|
```
|