Initial data commit

Task/Y-combinator/Groovy/y-combinator-1.groovy

@@ -0,0 +1,13 @@
+def Y = { le -> ({ f -> f(f) })({ f -> le { x -> f(f)(x) } }) }
+
+def factorial = Y { fac ->
+    { n -> n <= 2 ? n : n * fac(n - 1) }
+}
+
+assert 2432902008176640000 == factorial(20G)
+
+def fib = Y { fibStar ->
+    { n -> n <= 1 ? n : fibStar(n - 1) + fibStar(n - 2) }
+}
+
+assert fib(10) == 55

Task/Y-combinator/Groovy/y-combinator-2.groovy

@@ -0,0 +1,7 @@
+def Y = { le -> ({ f -> f(f) })({ f -> le { Object[] args -> f(f)(*args) } }) }
+
+def mul = Y { mulStar -> { a, b -> a ? b + mulStar(a - 1, b) : 0 } }
+
+1.upto(10) {
+    assert mul(it, 10) == it * 10
+}