2016 Update

Task/Catamorphism/Groovy/catamorphism.groovy

@@ -0,0 +1,13 @@
+def vector1 = [1,2,3,4,5,6,7]
+def vector2 = [7,6,5,4,3,2,1]
+def map1 = [a:1, b:2, c:3, d:4]
+
+println vector1.inject { acc, val -> acc + val }       // sum
+println vector1.inject { acc, val -> acc + val*val }   // sum of squares
+println vector1.inject { acc, val -> acc * val }       // product
+println vector1.inject { acc, val -> acc<val?val:acc } // max
+println ([vector1,vector2].transpose().inject(0) { acc, val -> acc + val[0]*val[1] }) //dot product (with seed 0)
+
+println (map1.inject { Map.Entry accEntry, Map.Entry entry ->     // some sort of weird map-based reduction
+    [(accEntry.key + entry.key):accEntry.value + entry.value ].entrySet().toList().pop()
+})