September 2017 Update

Task/Fibonacci-sequence/JavaScript/fibonacci-sequence-10.js

@@ -0,0 +1,22 @@
+(() => {
+    'use strict';
+
+    // fib :: Int -> Int
+    let fib = n => range(1, n)
+        .reduce(([a, b]) => [b, a + b], [0, 1])[0];
+
+
+    // GENERIC [m..n]
+
+    // range :: Int -> Int -> [Int]
+    let range = (m, n) =>
+        Array.from({
+            length: Math.floor(n - m) + 1
+        }, (_, i) => m + i);
+
+
+    // TEST
+    return fib(32);
+
+    // --> 2178309
+})();