| 1 | export default function createStore(initialState) {
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| 2 | let state = initialState;
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| 3 | const listeners = [];
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| 4 |
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| 5 | function setState(partial) {
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| 6 | state = { ...state, ...partial };
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| 7 | for (let i = 0; i < listeners.length; i++) {
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| 8 | listeners[i]();
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| 9 | }
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| 10 | }
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| 11 |
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| 12 | function getState() {
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| 13 | return state;
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| 14 | }
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| 15 |
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| 16 | function subscribe(listener) {
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| 17 | listeners.push(listener);
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| 18 |
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| 19 | return function unsubscribe() {
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| 20 | const index = listeners.indexOf(listener);
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| 21 | listeners.splice(index, 1);
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| 22 | };
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| 23 | }
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| 24 |
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| 25 | return {
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| 26 | setState,
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| 27 | getState,
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| 28 | subscribe,
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| 29 | };
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| 30 | }
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