Initial data commit

Task/Y-combinator/Scala/y-combinator-1.scala

@@ -0,0 +1,7 @@
+def Y[A, B](f: (A => B) => (A => B)): A => B = {
+  case class W(wf: W => (A => B)) {
+    def apply(w: W): A => B = wf(w)
+  }
+  val g: W => (A => B) = w => f(w(w))(_)
+  g(W(g))
+}

Task/Y-combinator/Scala/y-combinator-2.scala

@@ -0,0 +1,5 @@
+val fac: Int => Int = Y[Int, Int](f => i => if (i <= 0) 1 else f(i - 1) * i)
+fac(6)  //> res0: Int = 720
+
+val fib: Int => Int = Y[Int, Int](f => i => if (i < 2) i else f(i - 1) + f(i - 2))
+fib(6)  //> res1: Int = 8