setExtension removes part of a filename if it contained dot

[tapoton]

I'm composing a path to a file. The name of this file does not have extension, but it contains a dot (e.g. "fullPath/abc.xyz"). When I try to set the extension for this file (e.g. "txt"), I get not what I expect: "fullPath/abc.txt".

Looking at this code, I understand how it happens.

  String setExtension(String path, String extension) =>
      withoutExtension(path) + extension;

It looks like a naming problem for me. I have no option so set the extension for the file without extension.
What do you think?

[natebosch]

If you want to add an extension without removing an existing extension (or portion of a filename following a .) you can do it manually. I would avoid setExtension or withoutExtension if you are using file names where the . does not indicate a file extension.