For me, personally, React (Angular, Vue, jQuery) is a tools that make our life as a developer easier. It more like we want to build a dinner table. We need nails, screwdriver, hammer, saw and etc. We can put aside all these tools and the result, we still can get our table, but maybe the ugly and unstable table. Same things with this topic. We can use or not to use any JavaScript libraries or frameworks. But this is what I always say this to my fellow web developer. It is depend on your project. Not all web projects prefer to use React, or any kind of JavaScript tools. And some projects prefer to use vanilla JavaScript, and some prefer to use the old JavaScript libraries, such as BackboneJS, jQuery. If you asked, why developers still use this old school library, and why the old school library still exists? This is because the usage of these library is still on demand. Not all developers and projects prefer to use React, Vue, Angular. That's why I totally agree and suggest if you want to get strong in any library and framework, you should know what are you doing and have strong foundation on any languages, not only in JavaScript.
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For me, personally, React (Angular, Vue, jQuery) is a tools that make our life as a developer easier. It more like we want to build a dinner table. We need nails, screwdriver, hammer, saw and etc. We can put aside all these tools and the result, we still can get our table, but maybe the ugly and unstable table. Same things with this topic. We can use or not to use any JavaScript libraries or frameworks. But this is what I always say this to my fellow web developer. It is depend on your project. Not all web projects prefer to use React, or any kind of JavaScript tools. And some projects prefer to use vanilla JavaScript, and some prefer to use the old JavaScript libraries, such as BackboneJS, jQuery. If you asked, why developers still use this old school library, and why the old school library still exists? This is because the usage of these library is still on demand. Not all developers and projects prefer to use React, Vue, Angular. That's why I totally agree and suggest if you want to get strong in any library and framework, you should know what are you doing and have strong foundation on any languages, not only in JavaScript.