In my experience, I actually learned more about Javascript the more that I had to work with React. The reason for this is because frameworks give you the context for which you use the basic tools that you learn with a language. So, it's kind of like when you are given an example to explain a concept. Also, I personally think languages themselves are very trivial - it's basically a toolbox - and the tough part is actually understanding how those parts come together to build something bigger than the sum of parts.
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In my experience, I actually learned more about Javascript the more that I had to work with React. The reason for this is because frameworks give you the context for which you use the basic tools that you learn with a language. So, it's kind of like when you are given an example to explain a concept. Also, I personally think languages themselves are very trivial - it's basically a toolbox - and the tough part is actually understanding how those parts come together to build something bigger than the sum of parts.