Thats completely fair enough to be a "lazy developer" - I am too especially at work :) but in my spare time, for me, I just want to know how the sausage is made

Thats completely fair enough to be a "lazy developer" - I am too especially at work :) but in my spare time, for me, I just want to know how the sausage is made! Like, how do JavaScript arrays work under the hood? Etc etc