RxJS
https://www.google.com/search?q=RxJS+良さ&oq=RxJS+良さ&aqs=chrome..69i57.4459j0j7&sourceid=chrome&ie=UTF-8
RxJS入門 - RxJSとは | CodeGrid
https://app.codegrid.net/entry/2017-rxjs-1
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