Objective-C, with prior java experience (some Swing, then more Cocoa, till Apple dropped java), Modula-2, Pascal, SmallTalk; pdp-11, hp2100 and 6502 assembly language. Writing in-house apps that help entering biological data, and do some number crunching on it (likelihood calculations).

Stuck with Java until Objective-C finally adopted garbage collection, only to find myself switching to ARC soon afterward. Apple could have eased out of Java by keeping a downscaled Java bridge, only allowing e.g. simple types, Strings, NSData or other kind of serialization for method arguments and results. However, I am glad now I made the switch.

Enthusiastic (but struggling) with Swift now, with strong hopes Apple will add to or update some ageing or deprecated tutorials.