string - Need a basename function in Javascript

Question

I need a short basename function (one-liner ?) for Javascript:

basename("/a/folder/file.a.ext") -> "file.a"
basename("/a/folder/file.ext") -> "file"
basename("/a/folder/file") -> "file"

That should strip the path and any extension.

Update: For dot at the beginning would be nice to treat as "special" files

basename("/a/folder/.file.a.ext") -> ".file.a"
basename("/a/folder/.file.ext") -> ".file"
basename("/a/folder/.file") -> ".file" # empty is Ok
basename("/a/folder/.fil") -> ".fil"  # empty is Ok
basename("/a/folder/.file..a..") -> # does'nt matter

Answer 1

function basename(path) {
   return path.split('/').reverse()[0];
}

Breaks up the path into component directories and filename then returns the last piece (the filename) which is the last element of the array.