Scala define function standard

Question

The following are equivalent:

scala> val f1 = {i: Int => i == 1}
f1: Int => Boolean = <function1>

scala> val f2 = (i: Int) => i == 1
f2: Int => Boolean = <function1>

I am more familiar with the former (coming from Groovy), but the latter form is much more common, AFAIK, the standard way to define a function in Scala.

Should I forget the past (Groovy) and adopt the 2nd form? The 1st form is more natural for me as it looks similar to Groovy/Ruby/Javascript way of defining closures (functions)

EDIT
See Zeiger's answer in this thread, for an example where groovy/ruby/javascript closure {=>} syntax seems more natural than () => I assume both can be used interchangeably with same performance, ability to pass around, etc. and that the only difference is syntax

Answer 1

I think that this is the matter of taste (scala styleguide recommends first one). The former one allow you to write multiline (>2 lines in body) functions:

val f1 = { i: Int =>
  val j = i/2
  j == 1
}

Sometimes it is useful