How is such a structure organized?

Question

JavaScript

Hi everybody! In what direction to dig in order to understand how such a structure with "inheritance" of the show function is organized? I tried to look in the sources on the git, I didn’t really understand anything as a beginner. Thanks in advance!
UIkit.switcher(element).show(index);
ps Just do not need answers in the style of Google to help, why do you need it - learn the basics, etc. etc.

Answer 1

From the switcher method, return an object with the show method.
https://learn.javascript.ru/task/chain-calls