[tntn]

What is the syntactic sugar here? I mostly see a map that doesn't behave how anyone would expect.

[JoeNr76]

The syntactic sugar here is that map and parseInt can be called without specifying all parameters. (But, since JS has no function overloading, it's the same function you're calling.)

[zbentley]

Optional/defaulted function arguments are an extremely useful feature of many programming languages; are you arguing that they are always harmful?

[JoeNr76]

Point me in my remark where I said that they are harmful. I was answering the question what the syntactic sugar was.