Function Literal : Ways to define Function Literal

scala> // An Anonymous function is a Function Literal if the function

scala> // body ends up with a single statement (here in our case x.split(" ")

scala> 

scala> // WAYS to define a Function Literal

scala> val inputList = List("This is a string", "This is also a string")
inputList: List[String] = List(This is a string, This is also a string)

scala> 

scala> // Way 1 : Assign the Function Literal to a variable(This is different

scala> //         from using 'def' to define a Named Function)

scala> val fn1:String => Array[String] = x => x.split(" ")
fn1: String => Array[String] = <function1>

scala> val result = inputList.map(fn1)
result: List[Array[String]] = List(Array(This, is, a, string), Array(This, is, also, a, string))

scala> 

scala> // Way 2 : Use Function1, Function2, etc...

scala> val fn1:Function1[String, Array[String]] = x => x.split(" ")
fn1: String => Array[String] = <function1>

scala> val result = inputList.map(fn1)
result: List[Array[String]] = List(Array(This, is, a, string), Array(This, is, also, a, string))

scala> 

scala> // Way 3 : Pass the Function Literal Directly as Argument

scala> val result = inputList.map( x => x.split(" "))
result: List[Array[String]] = List(Array(This, is, a, string), Array(This, is, also, a, string))