There have been several steep ones like: cross-browser CSS (before widely adopted standards). Writing multi-threaded server apps. SOLID principles for OOP. The latest one has been functional programming. I'd say overall the thing I still find challenging is just organizing my code properly.
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There have been several steep ones like: cross-browser CSS (before widely adopted standards). Writing multi-threaded server apps. SOLID principles for OOP. The latest one has been functional programming. I'd say overall the thing I still find challenging is just organizing my code properly.