Optional braces
In match expressions, at least, you can save a byte by using indentation-based syntax.
a match
case b=>c
case d=>e
is 27 bytes, while the below code is 28.
a match{case b=>c case d=>e}
As a side note, match
also gets special treatment when it comes to chaining. The following Scala 2 code:
("foo"match{case x=>x})match{case x=>x}
can now be written without the parentheses:
"foo"match{case x=>x}match{case x=>x}