scala-cheatsheet

scala-cheatsheet.scala

val a:Int = 0   // immutable
var b:Int = 0   // mutable
def foo(a: Int): Int = ??? // function definition

// anonymous function. (x: Int) is parameter. x * x is body
(x: Int) => x * x    
// above can be rewriten with (with  a name f)
def f(x:Int): Int = x * x
// function that accept another function in argument
def f(g: Int => Int, a: Int): Int = f(a) + a
// function that returns another function
def f(a: Int): Int => Int = {
  def g(b: Int): Int = { ??? }
  g
}
// above can be rewriten with...
def f(a: Int)(b: Int): Int = { ??? } 


// Type of f ?
def f(a: Int => Int)(b: Int, c: Int): Int = ...

(Int => Int) => (Int, Int) => Int