Looking at Scala, the difference between val and var is huge, with val being at 2nd, and var at 38.
I wonder what percentage of `_` usage is value/type discarding in pattern matching and type signatures vs. function application.
Would be nice to somehow ditch `case`:
adt match {
Foo(x) if cond x => ...
Bar(x) => ...
}
pairs.map{ (a,b) =>
...
}