The effective way to learn those things (especially with the larger library languages) involves copious use of search engines and ctrl-f in books/manuals, lol.

The effective way to learn those things (especially with the larger library languages) involves copious use of search engines and ctrl-f in books/manuals, lol. Some things you'll repeat enough that you know it by heart. Other things might be really basic, but you'll still have to google it from time to time. What does come nicely with time is you start to build up a mental model of "hrmm, I want to do this, but I need an XYZ. I know in ObjC I used XYZ, does Scala have that? Oh neat it has something similar!"