September 2017 Update

Task/Fibonacci-sequence/JavaScript/fibonacci-sequence-8.js

@@ -1,22 +1,10 @@
-(() => {
-    '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
-})();
+function* fibonacciGenerator() {
+    var prev = 0;
+    var curr = 1;
+    while (true) {
+        yield curr;
+        curr = curr + prev;
+        prev = curr - prev;
+    }
+}
+var fib = fibonacciGenerator();