Totally depends on your out-look. As a hiring manager, seeing somebody that only knows "React" and not fundamentals, makes them massively less flexible and restricts their usefulness.
Having somebody who knows Javascript and React suddenly becomes much more appealing hire.
React code is very confusing compared to vanilla javascript, which can lead to being overwhelmed not knowing what is react, what is javascript, why does this say "(event) =>" and why does this say "event =>", why does "this" change when using => - without knowing the language fundamentals it can make this massively harder to understand, because you just end up memorising patterns rather understanding what your writing.
100% people have their own learning styles, but the most successful people in life have deep understanding in their subjects, so it is vital to learn the fundamentals "as well".
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Totally depends on your out-look. As a hiring manager, seeing somebody that only knows "React" and not fundamentals, makes them massively less flexible and restricts their usefulness.
Having somebody who knows Javascript and React suddenly becomes much more appealing hire.
React code is very confusing compared to vanilla javascript, which can lead to being overwhelmed not knowing what is react, what is javascript, why does this say "(event) =>" and why does this say "event =>", why does "this" change when using => - without knowing the language fundamentals it can make this massively harder to understand, because you just end up memorising patterns rather understanding what your writing.
100% people have their own learning styles, but the most successful people in life have deep understanding in their subjects, so it is vital to learn the fundamentals "as well".