The extension of "hello.foo.bar.exe" is ".exe".
1 assertEmpty(Path().extension); 2 assertEmpty(Path("").extension); 3 assertEmpty(Path("/").extension); 4 assertEmpty(Path("/hello").extension); 5 assertEmpty(Path("C:/hello/world").extension); 6 assertEqual(Path("C:/hello/world.exe").extension, ".exe"); 7 assertEqual(Path("hello/world.foo.bar.exe").extension, ".exe");
The extension of the path including the leading dot.