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

The convention is to name constructor functions (i.e. functions that will be used with the new keyword) with starting capital.

function MyType(simpleVar) {
    this.simpleVar = simpleVar;
}

myObject = new MyType(42);