The dialect of Scala in use here is Dotty, which is
the test-bed compiler for ideas for Scala 3. This is selected by the use of
the "0.11.0-RC1" compiler version in build.sc. The main new feature present
so far is the automatic tupling of function parameters
which means I can write things like this:
def seen = sums.scanLeft(Set.empty)(_ + _)
def dups = (seen zip sums).filter(_ contains _).map((_, sum) => sum)instead of things like this:
def seen = sums.scanLeft(Set.empty)({ case (a, b) => a + b })
def dups = (seen zip sums).filter({ case (a, b) => a contains b }).map({ case (_, sum) => sum })You'll need a Java runtime installed. You'll also need the
Mill build tool installed. Once you
have these, you should be able to build and run the individual days'
code like mill day<n>.run, or you can run all of them with mill _.run.