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\n\n[](https://img.shields.io/travis/atayahmet/observer-js?style=flat-square) [](https://img.shields.io/npm/v/@atayahmet/observer-js?style=flat-square)   \n\nSimple light-weight observable pub/sub library. You can create multiple subject and observers and manage these objects using features.\n\n> **Note:** All subscriptions work asynchronously.\n\n## Installation\n\nUse the package manager [yarn](https://yarnpkg.com/) or [npm](https://www.npmjs.com) to install.\n\n```sh\n$ npm i @atayahmet/observer-js --save\n```\n\n```sh\n$ yarn add @atayahmet/observer-js\n```\n\n## Usage\n\n```js\nimport Subject from '@atayahmet/observer-js';\n```\n\n**Create new subject:**\n\n```js\nconst subject = new Subject();\n\n// start subscribe\nsubject.subscribe(data => console.log('Test subscribe 1!', data));\nsubject.subscribe(data => console.log('Test subscribe 2!', data));\n\n// run all observers.\nsubject.notify('Hello World!');\n```\n\n**Unsubscribe an observer:**\n\n```js\nconst subject = new Subject();\nconst sub$ = subject.subscribe(data => console.log('Remove subscription!', data));\n\nsub$.unsubscribe();\n```\n\n**Cancel all observers in one time:**\n\n```js\nsubject.subscribe(() => console.log('Test subscribe 1!'));\nsubject.subscribe(() => console.log('Test subscribe 2!'));\n\n// cancelled.\nsubject.cancel();\n\n// this will not notify to all observers one time\nsubject.notify();\n```\n\n**Pause and Resume observers:**\n\n```js\nsubject.subscribe(() => console.log('Test subscribe 1!'));\nsubject.subscribe(() => console.log('Test subscribe 2!'));\n\n// paused all observers.\nsubject.pause();\n\n// this will not notify observers until you resume observers.\nsubject.notify();\n\n// activate all observers again.\nsubject.resume();\n```\n\n**Reset the subject completely:**\n\n```js\nsubject.reset();\n```\n\n**Get total count of active observers:**\n\n```js\nconst sub1$ = subject.subscribe(() => console.log('Test subscribe 1!'));\nconst sub2$ = subject.subscribe(() => console.log('Test subscribe 2!'));\n\nsubject.size(); // output: 2\n\nsub1$.unsubscribe();\n\nsubject.size(); // output: 1\n```\n\n**onCompleted:**\n\n```js\nsubject.subscribe(data => console.log('Test subscribe 1!'));\nsubject.subscribe(data => console.log('Test subscribe 2!'));\n\nsubject.onCompleted(() => console.log('All observers worked successfuly!'));\nsubject.notify('Go!');\n```\n\n## Built With\n\n- [TypeScript](https://www.typescriptlang.org)\n\n## Versioning\n\nWe use [SemVer](http://semver.org/) for versioning. For the versions available, see the [tags on this repository](https://github.com/atayahmet/observer-js/tags).\n\n## Authors\n\n- [**Ahmet ATAY**](https://github.com/atayahmet) - _Initial work_\n\nSee also the list of [contributors](https://github.com/atayahmet/observer-js/contributors) who participated in this project.\n\n## Contributing\n\nPull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.\n\n## License\n\n[MIT](https://choosealicense.com/licenses/mit/)\n","readmeFilename":"README.md"}
![\"observer-js\"](\"/logo.png\"){kind=logo}
\n \n