When should I name things with initial capital letters?

Question

I have always wondered when to use identifiers (for example, functions) with capital first letter instead of camel case. I always write my JS in camel case like thi

Answer 1

According to the book "Javascript: the good parts", you should only capitalise the first character of the name of a function when you need to construct the object by "new" keyword.

This is called "the Constructor Invocation Pattern", a way to inherits.