{count}
\n \n \n )\n}\n\nexport default MyComponent;\n```\n\n`store.count` is updated using `setCount` function from the tuple returned by `useChange` (just like using `React.useState`). It can also be updated just by direct modification of `count` property:\n\n```js\n// ...\n// you can do it from anywhere\nstore.count = 69; // nice\n```\n\nThe example shows how you can use the hook as a local data store for a component but `store` object can be exported and used by other components. This may be an anti-DRY pattern, that's why it's recommended to use `Provider` exported from `use-change`.\n\n## 💡 Quick start using Provider and store as a class instance\n\n1. Install the library by `npm i use-change` or `yarn add use-change`.\n2. Define an object of any shape. At this case this is a store class instance instead of an in-line object.\n3. Wrap your components by `Provider` exported by `use-change`.\n4. Add `useChange` to your components.\n\n```js\n// ./store.ts\n// export the store class to use it for type references\nexport class RootStore {\n public count = 0;\n}\n\nexport default new RootStore(); // init the store instance\n```\n\n```js\n// ./App.tsx\nimport React, { ReactElement } from 'react';\nimport { Provider as UseChangeProvider } from 'use-change';\nimport MyComponent from './MyComponent';\nimport store from './store';\n\nconst App = (): ReactElement => (\n{count}
\n \n \n )\n}\n\nexport default MyComponent;\n```\n\n## 👷 Designing the store\n\nLet's make it a little bit detailed and add a few classess that may be responsible for different aspects of data. Those classes may consist of user info, fetched data, persistent data or anything else that you want to keep at its own place. But for simplicity let's create a few classess that also consist of counts.\n\n```js\n// ./store.ts\nclass StoreBranchA {\n public aCount = 0;\n}\n\nclass StoreBranchB {\n public bCount = 0;\n}\n\n// those classes can also be initialised at class constructor\nexport class RootStore {\n public readonly storeBranchA = new StoreBranchA();\n public readonly storeBranchB = new StoreBranchB();\n}\n\n// export store selectors or, in other words, paths to the objects\nexport const ROOT = (store: RootStore) => store;\nexport const PATH_A = ({ storeBranchA }: RootStore) => storeBranchA;\nexport const PATH_B = ({ storeBranchB }: RootStore) => storeBranchB;\n\nexport default new RootStore();\n```\n\nAt this example we're also exporting so-called \"store selectors\". The selectors are one-line arrow functions that provide paths to desired store objects. This makes the code look clean without providing things like `({ users }: RootStore) => users` every time, but instead we define a simple reusable constant. In case of users the constant can be called `USERS` and applied as the first `useChange` argument: `useChange(USERS, 'something')` (get `store.users.something` property). It's not required but recommended in order to make code look much nicer.\n\nAlso take a look at the `ROOT` store selector. It's going to be used to get and modify properties from the store itself like that: `useChange(ROOT, 'count')` to avoid usage of duplicating `(store: RootStore) => store` function.\n\nDon't worry, that's the only kind of constants that are going to be exported.\n\n```js\n// ./MyComponent.tsx\nimport React, { ReactElement } from 'react'\nimport useChange from 'use-change';\nimport { PATH_A, PATH_B } from './store';\n\nconst MyComponent = (): ReactElement => {\n const [countA, setCountA] = useChange(PATH_A, 'countA');\n const [countB, setCountB] = useChange(PATH_B, 'countB');\n \n return (\n <>\n{countA}
\n \n{countB}
\n \n \n )\n}\n```\n\nAs you can see the component doesn't modify store object implicitly, therefore it's not possible to change it directly (via assignment operator) from components. You can try to do that though to see how component reacts on changes of a listened property.\n \n```js\n// ...\nimport store, { RootStore } from './store';\n\nsetInterval(() => {\n store.storeBranchA.countA++;\n}, 1000);\n\nconst MyComponent = (): ReactElement => {\n// ...\n```\n\n\nThe component is going to be updated every second since it listens to the `store.storeBranchA.countA` property changes.\n\nThe property can also be manipulated manually inside class methods.\n\n```js\nclass RootStore {\n public count = 0;\n\n constructor() {\n setInterval(() => {\n this.incrementCount();\n }, 1000);\n }\n\n public readonly incrementCount() {\n this.count++;\n }\n}\n```\n\n## ✔️ Summary\n\nCongrats! You basically passed the tutorial of how to use `use-change` hook! Thousand times simpler than Redux or MobX, right? Let's just mention a few last notes:\n\n**The hook supports two overloads**\n1. Explicit store use. At this case you pass the store object to `useChange` hook: `useChange{count}
\n \n \n )\n}\n\nexport default MyComponent;\n```\n\n`store.count` is updated using `setCount` function from the tuple returned by `useChange` (just like using `React.useState`). It can also be updated just by direct modification of `count` property:\n\n```js\n// ...\n// you can do it from anywhere\nstore.count = 69; // nice\n```\n\nThe example shows how you can use the hook as a local data store for a component but `store` object can be exported and used by other components. This may be an anti-DRY pattern, that's why it's recommended to use `Provider` exported from `use-change`.\n\n## Quick start using Provider and store as a class instance 💡\n\n1. Install the library by `npm i use-change` or `yarn add use-change`.\n2. Define an object of any shape. At this case this is a store class instance instead of an in-line object.\n3. Wrap your components by `Provider` exported by `use-change`.\n4. Add `useChange` to your components.\n\n```js\n// ./store.ts\n// export the store class to use it for type references\nexport class RootStore {\n public count = 0;\n}\n\nexport default new RootStore(); // init the store instance\n```\n\n```js\n// ./App.tsx\nimport React, { ReactElement } from 'react';\nimport { Provider as UseChangeProvider } from 'use-change';\nimport MyComponent from './MyComponent';\nimport store from './store';\n\nconst App = (): ReactElement => (\n{count}
\n \n \n )\n}\n\nexport default MyComponent;\n```\n\n## Designing the store 👷\n\nLet's make it a little bit detailed and add a few classess that may be responsible for different aspects of data. Those classes may consist of user info, fetched data, persistent data or anything else that you want to keep at its own place. But for simplicity let's create a few classess that also consist of counts.\n\n```js\n// ./store.ts\nclass StoreBranchA {\n public aCount = 0;\n}\n\nclass StoreBranchB {\n public bCount = 0;\n}\n\n// those classes can also be initialised at class constructor\nexport class RootStore {\n public readonly storeBranchA = new StoreBranchA();\n public readonly storeBranchB = new StoreBranchB();\n}\n\n// export store selectors or, in other words, paths to the objects\nexport const ROOT = (store: RootStore) => store;\nexport const PATH_A = ({ storeBranchA }: RootStore) => storeBranchA;\nexport const PATH_B = ({ storeBranchB }: RootStore) => storeBranchB;\n\nexport default new RootStore();\n```\n\nAt this example we're also exporting so-called \"store selectors\". The selectors are one-line arrow functions that provide paths to desired store objects. This makes the code look clean without providing things like `({ users }: RootStore) => users` every time, but instead we define a simple reusable constant. In case of users the constant can be called `USERS` and applied as the first `useChange` argument: `useChange(USERS, 'something')` (get `store.users.something` property). It's not required but recommended in order to make code look much nicer.\n\nAlso take a look at the `ROOT` store selector. It's going to be used to get and modify properties from the store itself like that: `useChange(ROOT, 'count')` to avoid usage of duplicating `(store: RootStore) => store` function.\n\nDon't worry, that's the only kind of constants that are going to be exported.\n\n```js\n// ./MyComponent.tsx\nimport React, { ReactElement } from 'react'\nimport useChange from 'use-change';\nimport { PATH_A, PATH_B } from './store';\n\nconst MyComponent = (): ReactElement => {\n const [countA, setCountA] = useChange(PATH_A, 'countA');\n const [countB, setCountB] = useChange(PATH_B, 'countB');\n \n return (\n <>\n{countA}
\n \n{countB}
\n \n \n )\n}\n\nexport default MyComponent;\n```\n\nAs you can see the component doesn't modify store object implicitly, therefore it's not possible to change it directly (via assignment operator) from components. You can try to do that though to see how component reacts on changes of a listened property.\n \n```js\n// ...\nimport store, { RootStore } from './store';\n\nsetInterval(() => {\n store.storeBranchA.countA++;\n}, 1000);\n\nconst MyComponent = (): ReactElement => {\n// ...\n```\n\n\nThe component is going to be updated every second since it listens to the `store.storeBranchA.countA` property changes.\n\nThe property can also be manipulated manually inside class methods.\n\n```js\nclass RootStore {\n public count = 0;\n\n constructor() {\n setInterval(() => {\n this.incrementCount();\n }, 1000);\n }\n\n public readonly incrementCount() {\n this.count++;\n }\n}\n```\n\n## Summary 🧑🎓\n\nCongrats! You basically passed the tutorial of how to use `use-change` hook! Let's just mention a few last notes:\n\n**The hook supports two overloads**\n1. Explicit store use. At this case you pass the store object to `useChange` hook: `useChange![\"\"/](\"https://avatars.githubusercontent.com/u/37793399?v=4?s=100\") Ivan Teplov 📖 ⚠️ 💻 | \n