2016 Update

Task/Fibonacci-sequence/JavaScript/fibonacci-sequence-5.js

@@ -1,10 +1,17 @@
-function* fibonacciGenerator() {
-    var prev = 0;
-    var curr = 1;
-    while (true) {
-        yield curr;
-        curr = curr + prev;
-        prev = curr - prev;
-    }
+function Y(dn) {
+    return (function(fn) {
+        return fn(fn);
+    }(function(fn) {
+        return dn(function() {
+            return fn(fn).apply(null, arguments);
+        });
+    }));
 }
-var fib = fibonacciGenerator();
+var fib = Y(function(fn) {
+    return function(n) {
+        if (n === 0 || n === 1) {
+            return n;
+        }
+        return fn(n - 1) + fn(n - 2);
+    };
+});