basicFunctions.scala

// Returns the input
def identity(x: Int) = x

// Calculates  cube  of  a  number
def cube(x: Int) = x * x * x

// Calculates factorial of a number
def factorial(x: Int): Int =
  if (x <= 1) 1 else x * factorial(x - 1)


//Sum function, adds up all ints between a and b
def sum(a: Int, b: Int): Int =
  if (a > b) 0 else a + sum(a + 1, b)