[kyle_t]

It truly is and even for experienced developers it can be overwhelming. It is simply impossible for anyone person to be knowledgeable every new technology and/or programming language.

I used to constantly fall in the trap of shallow but wide breadth of knowledge. Something new would come out and I would drop everything and dive right in. It feels rewarding at the time but really in the end has very little benefit (unless of course your a tech reporter).

My advice is to achieve a narrow and deep knowledge base. Pick a few that you feel passionate about and really concentrate on mastering those. It would help to pick those that have a large number of related job openings if its your livelihood. Mastering Java may seem old school, but the number of job postings I still see for java developers is amazing.

[danielweber]

It is incredibly fatiguing. Oh, you were working at a company for two years on technology X? Sorry, we need to hire someone who knows Y which you couldn't because you were working on X. No, I don't care that you could learn it in 3 days, our HR procedure says we can't give you 3 days.

Then I go download some C source code from 15 years ago and it still compiles just fine and I smile a little bit.