Initial data commit

Task/Catamorphism/JavaScript/catamorphism-1.js

@@ -0,0 +1,17 @@
+var nums = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+
+function add(a, b) {
+    return a + b;
+}
+
+var summation = nums.reduce(add);
+
+function mul(a, b) {
+    return a * b;
+}
+
+var product = nums.reduce(mul, 1);
+
+var concatenation = nums.reduce(add, "");
+
+console.log(summation, product, concatenation);

Task/Catamorphism/JavaScript/catamorphism-2.js

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+(function (xs) {
+    'use strict';
+
+    // foldl :: (b -> a -> b) -> b -> [a] -> b
+    function foldl(f, acc, xs) {
+        return xs.reduce(f, acc);
+    }
+
+    // foldr :: (b -> a -> b) -> b -> [a] -> b
+    function foldr(f, acc, xs) {
+        return xs.reduceRight(f, acc);
+    }
+
+    // Test folds in both directions
+    return [foldl, foldr].map(function (f) {
+        return f(function (acc, x) {
+            return acc + (x * 2).toString() + ' ';
+        }, [], xs);
+    });
+
+})([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);

Task/Catamorphism/JavaScript/catamorphism-3.js

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+var nums = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+
+console.log(nums.reduce((a, b) => a + b, 0)); // sum of 1..10
+console.log(nums.reduce((a, b) => a * b, 1)); // product of 1..10
+console.log(nums.reduce((a, b) => a + b, '')); // concatenation of 1..10