Curly braces instead of parentheses
In any method invocation in Scala in which you're passing in exactly one argument, you can opt to use curly braces to surround the argument instead of parentheses.For example, instead of:
scala> println("Hello, world!")
Hello, world!
scala> println { "Hello, world!" }
Hello, world!
scala> val g = "Hello, world!"
g: java.lang.String = Hello, world!
scala> g.substring { 7, 9 }
<console>:1: error: ';' expected but ',' found.
g.substring { 7, 9 }
^
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