This reminded me of language / library attributes that I've been delighted by over the years ...here's a few: C : - function pointers combined with structs.

This reminded me of language / library attributes that I've been delighted by over the years ...here's a few: C : - function pointers combined with structs. - Ability to use pointers to go anywhere on the machines address space (think embedded, kernel code etc) and muck with registers, shared memory etc. C++ : - smart pointers - shared_ptr and friends. I'm not a big C++ fan in general but when I learned about smart pointers I was really impressed. Java : - interfaces - after treading around C++ objects in the 90s, interfaces were a dream - 'Runnable' interface and Thread class coupled with any object's wait(), notify() and notifyAll() methods. - generics Javascript : - async / await ..once I figured out how this worked i was really impressed. - object literal syntax. (Perl hashes were also pretty delightful years before - but not quite as much as JS) Python: - Iterators and the litany of looping and ranging constructs.