Right here there's 3 extra line (lines 81 - 83). The preferred formatting is, when you're closing braces, just close the in a row, one per line. It makes the unimportant parts of the code less big. As far as array data, that is formatted fine, I'm not talking about arranging data. It's more just white space that serves no purpose (another example is line 6 in FlowDirection.scala, line 17 doesn't really need to be there either). If you have questions about formatting, take a look at similar examples in the code base, we try to keep things in a standard format, although there are of course exceptions.