Scala : curry Scala : add factorial

1 files changed, 8 insertions, 0 deletions

diff --git a/Scala/sandbox/curry.scala b/Scala/sandbox/curry.scala
index 5c5577a..1a2e44c 100644
--- a/Scala/sandbox/curry.scala
+++ b/Scala/sandbox/curry.scala
@@ -29,6 +29,12 @@ object Curry {
   // add _ if you want to treat it as a partially applied function
   def sumCubesShort  = sumCurryShort(cube)_
 
+  // product
+  def product(f: Int => Int)(a: Int, b: Int): Int =
+    if (a > b) 1 else f(a) * product(f)(a + 1, b)
+
+  def fact(n: Int) = product(x => x)(1, n)
+
   def run = {
     println("Curry")
     println(sum(x => x * x, 3, 5))
@@ -37,6 +43,8 @@ object Curry {
     println(sumCubes(3, 5))
     println(sumCurryShort(cube)(3, 5))
     println(sumCubesShort(3, 5))
+    println(product(x => x * x)(3, 4))
+    println(fact(4))
   }
 
 }