Partially applied function as object

Question

Let

def f(i:Int)(j:Int) = i + j

and so

f(1) _
Int => Int = <function1>

However,

val f: (Int)(Int) => Int = (a:Int)(b:Int) => a + b  // wrong

namely, error: ';' expected but '(' found. How to declare val f ?

Answer 1

Is this what you were looking for?

scala> val f: Int => Int => Int = a => b => a + b
f: Int => (Int => Int) = <function1>

scala> f(1)
res7: Int => Int = <function1>

scala> f(1)(2)
res8: Int = 3