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54 changes: 31 additions & 23 deletions src/useSet.ts
Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
import { useCallback, useMemo, useState } from 'react';
import { useRef, useState } from 'react';

export interface StableActions<K> {
add: (key: K) => void;
Expand All @@ -13,28 +13,36 @@ export interface Actions<K> extends StableActions<K> {
}

const useSet = <K>(initialSet = new Set<K>()): [Set<K>, Actions<K>] => {
const [set, setSet] = useState(initialSet);

const stableActions = useMemo<StableActions<K>>(() => {
const add = (item: K) => setSet((prevSet) => new Set([...Array.from(prevSet), item]));
const remove = (item: K) =>
setSet((prevSet) => new Set(Array.from(prevSet).filter((i) => i !== item)));
const toggle = (item: K) =>
setSet((prevSet) =>
prevSet.has(item)
? new Set(Array.from(prevSet).filter((i) => i !== item))
: new Set([...Array.from(prevSet), item])
);

return { add, remove, toggle, reset: () => setSet(initialSet), clear: () => setSet(new Set()) };
}, [setSet]);

const utils = {
has: useCallback((item) => set.has(item), [set]),
...stableActions,
} as Actions<K>;

return [set, utils];
const [, forceUpdate] = useState({});
const setRef = useRef(new Set(initialSet));

const actions: Actions<K> = {
add: (item: K) => {
setRef.current.add(item);
forceUpdate({});
},
remove: (item: K) => {
setRef.current.delete(item);
forceUpdate({});
},
toggle: (item: K) => {
setRef.current.has(item)
? setRef.current.delete(item)
: setRef.current.add(item);
forceUpdate({});
},
reset: () => {
setRef.current = new Set(initialSet);
forceUpdate({});
},
clear: () => {
setRef.current.clear();
forceUpdate({});
},
has: (item: K) => setRef.current.has(item),
};

return [setRef.current, actions];
};

export default useSet;