Java has a function package with a standard set of functional interfaces.
It is easy to define each of these in Scala as well. Examples of some of these as below.
Predicate
def greaterThanTwo: Int => Boolean = (x : Int) => x > 2
println(greaterThanTwo(3))
Supplier
def booleanSupplier: Unit => Boolean = _ => true
println(booleanSupplier())
Consumer
def stringConsumer : String => Unit
= (s : String) => println(“Consumed “ + s)
stringConsumer(“ the burger word”)
Binary Operator
def sum : (Int , Int) => Int = (x : Int, y : Int) => x + y
println(sum(10,20))
Function
def physical : ( Int , Double) => String = ( age : Int, weight : Double ) => s”Aged ${age} weighting ${weight} pounds”
println(physical(35, 102))
Other specialized variants of the above types are present for Double type, Int type etc are just as easily definable in Scala.
