Scala partial functions and combination of partial functions
We have list of Partial Functions pf0-pf3, each has a personal domain area. val sqv: Seq[Int] = (-5 to 20 by 1).toList val pf0: PartialFunction[Int,Int] = {case i if i < 0 => 0} val pf1: PartialFunction[Int,Int] = {case i if i >= 0 && i <= 5 => i + 10 } val pf2: PartialFunction[Int,Int] = {case i if i > 5 && i <= 10 => i + 2 } val pf3: PartialFunction[Int,Int] = {case i if i > 10 => i - 1 } 1) combine functions "manually" val f = pf0 orElse pf1 orElse pf2 orElse pf3 val r1 = sqv map f output: val sqv: Seq[Int] = List(-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20) val r1: Seq[Int] = List(0, 0, 0, 0, 0, 10, 11, 12, 13, 14, 15, 8, 9, 10, 11, 12, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19) 2) combine with foldLeft val sqFunc: Seq[PartialFunction[Int,Int]] = Seq(pf0, pf1, pf2, pf3) val ff: PartialFunction[Int,Int]= sqFunc.foldLeft(sqFunc.he