What's the difference between using and no using a “=” in Scala defs ?

Question

What the difference between the two defs below

def someFun(x:String) { x.length } 

AND

def someFun(x:String) = {          


        

Answer 1

Note that the Scala Style guide always recommend using '=', both in

• method declaration

Methods should be declared according to the following pattern:

def foo(bar: Baz): Bin = expr

• function declaration

Function types should be declared with a space between the parameter type, the arrow and the return type:

def foo(f: Int => String) = ...
def bar(f: (Boolean, Double) => List[String]) = ...