Scala Currying & By-name parameter (function value)

by-name parameter.scala

scala> def a(x : => Unit) { print("a") }
a: (x: => Unit)Unit

scala> a {
     | print("b")
     | }

currying.scala

scala> def a(x:Int)(y : => Int) {
     |  print(x+y)
     | }
a: (x: Int)(y: => Int)Unit


scala> val b = a(10)_
b: (=> Int) => Unit = <function1>

scala> b { 20 }
30

// -----------------------------------------------------------------------


scala> def a(x:Int) = (y:Int) => print(x+y)
a: (x: Int)(Int) => Unit

scala> val b = a(10)
b: (Int) => Unit = <function1>

scala> b(20)
30

// -----------------------------------------------------------------------

scala> def a(x:Int)(y:Int)(z:Int) { print(x+y+z) }

scala> val b = a _

b: (Int) => (Int) => (Int) => Unit = <function1>

scala> val c = b(10)
c: (Int) => (Int) => Unit = <function1>

scala> val e = c(20)
e: (Int) => Unit = <function1>

scala> val f = e(30)
60f: Unit = ()