React was first released in 2013 by Facebook as an alternative to Angular.js. Earlier in angular.js which is a framework for UI interfaces, elements were not rendered properly concerning changing one state it affects another state of the application, and thus managing the front-end was a bit of a concern. Facebook was not working well with user interfaces, what it needs was to develop applications that are fast, scalable, and yet simple. So the purpose of React.js was to create large web applications that can change data, without reloading the page.
This way SPA was introduced to provide better performance and React along with more functionalities provides the developers a great library to create fully-fledged SPA applications with better code, design, and performance.
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