Scala By Example Chapter 9 Solutions - Exercise 9.4.1

Exercise 9.4.1 Consider a function which squares all elements of a list and re- turns a list with the results. Complete the following two equivalent definitions of squareList.

	object ListMap {
	def squareList(xs: List[Int]): List[Int] = xs match {
	case List() => xs
	case y :: ys => y * y :: squareList(ys)
	}
	def squareListMap(xs: List[Int]): List[Int] =
	xs map (x => x * x)
	def main(args: Array[String]) {
	println("squarelist for square of (9,13,21) returns : " + squareList(List(9, 13, 21)));
	println("squareListMap for square of (9,13,21) returns : " + squareList(List(9, 13, 21)));
	}
	}

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