Merge pull request mgechev#57 from FilipeFalcaoBatista/fibonacci-algorithm

mgechev · mgechev · commit d60b8b8c3449 · 2015-05-16T12:59:53.000+03:00
Fibonacci algorithm
diff --git a/src/others/fibonacci.js b/src/others/fibonacci.js
@@ -0,0 +1,37 @@
+/**
+ * Nth number of fibonacci's sequence
+ *
+ * Returns the nth number of fibonacci's sequence.
+ *
+ * @public
+ *
+ * @example
+ * var fibonacci = require('path-to-algorithms/src/others/fibonacci').fibonacci;
+ * var nth = fibonacci(20);
+ *
+ * console.log(nth); // 6765
+ *
+ * @param {Number} n The nth position in fibonacci's sequence
+ *
+ * @module others/fibonacci
+*/
+(function (exports) {
+  'use strict';
+
+  function fibonacci (n) {
+    var n1 = 0;
+    var n2 = 1;
+    var aux;
+
+    while (n > 0) {
+      aux = n1;
+      n1 = n2;
+      n2 += aux;
+      n = n - 1;
+    }
+
+    return n1;
+  }
+
+  exports.fibonacci = fibonacci;
+})(typeof window === 'undefined' ? module.exports : window);
