Pretty bad if you plan on employing lots of JS in the long run. As fantastic as jQuery is, when it's all you know, everything looks like a $-shaped nail.
That said, you don't need to go crazy and go off it cold turkey, you can very much expand your JS knowledge while using jQuery still for day to day AJAXy and DOM manipulation tasks.
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Pretty bad if you plan on employing lots of JS in the long run. As fantastic as jQuery is, when it's all you know, everything looks like a $-shaped nail.
That said, you don't need to go crazy and go off it cold turkey, you can very much expand your JS knowledge while using jQuery still for day to day AJAXy and DOM manipulation tasks.