2016 Update

Task/Sum-of-a-series/JavaScript/sum-of-a-series-2.js

@@ -1,17 +1,25 @@
-sum(function (x) { return 1 / (x * x) }, range(1, 1000));
+(function () {
 
-function sum(fn, lstRange) {
-  return lstRange.reduce(
-    function (lngSum, x) {
-      return lngSum + fn(x);
-    }, 0
-  );
-}
+  function sum(fn, lstRange) {
+    return lstRange.reduce(
+      function (lngSum, x) {
+        return lngSum + fn(x);
+      }, 0
+    );
+  }
 
-function range(m, n) {
-  return Array.apply(null, Array(n - m + 1)).map(
-    function (x, i) {
+  function range(m, n) {
+    return Array.apply(null, Array(n - m + 1)).map(function (x, i) {
       return m + i;
-    }
+    });
+  }
+
+
+  return sum(
+    function (x) {
+      return 1 / (x * x);
+    },
+    range(1, 1000)
   );
-}
+
+})();

Task/Sum-of-a-series/JavaScript/sum-of-a-series-3.js

@@ -0,0 +1 @@
+1.6439345666815615

Task/Sum-of-a-series/JavaScript/sum-of-a-series-4.js

@@ -0,0 +1,20 @@
+(() => {
+    'use strict';
+
+    // seriesSum :: Num a => (a -> a) -> [a] -> a
+    const seriesSum = (f, xs) =>
+        xs.reduce((a, x) => a + f(x), 0);
+
+
+    // GENERIC ------------------------------------------
+
+    // range :: Int -> Int -> [Int]
+    const range = (m, n) =>
+        Array.from({
+            length: Math.floor(n - m) + 1
+        }, (_, i) => m + i);
+
+    // TEST ----------------------------------------------
+
+    return seriesSum(x => 1 / (x * x), range(1, 1000));
+})();

Task/Sum-of-a-series/JavaScript/sum-of-a-series-5.js

@@ -0,0 +1 @@
+1.6439345666815615