diff --git a/DIRECTORY.md b/DIRECTORY.md
index d36d53b5..17182e46 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -7,11 +7,15 @@
     * [Generateparentheses.Test](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/backtracking/test/generateparentheses.test.ts)
 
 ## Bit Manipulation
+  * [Add Binary](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/bit_manipulation/add_binary.ts)
   * [Is Power Of 2](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/bit_manipulation/is_power_of_2.ts)
   * [Is Power Of 4](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/bit_manipulation/is_power_of_4.ts)
+  * [Log Two](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/bit_manipulation/log_two.ts)
   * Test
+    * [Add Binary.Test](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/bit_manipulation/test/add_binary.test.ts)
     * [Is Power Of 2.Test](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/bit_manipulation/test/is_power_of_2.test.ts)
     * [Is Power Of 4.Test](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/bit_manipulation/test/is_power_of_4.test.ts)
+    * [Log Two.Test](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/bit_manipulation/test/log_two.test.ts)
 
 ## Ciphers
   * [Xor Cipher](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/ciphers/xor_cipher.ts)
@@ -71,9 +75,11 @@
 
 ## Dynamic Programming
   * [Knapsack](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/dynamic_programming/knapsack.ts)
+  * [Lcs](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/dynamic_programming/lcs.ts)
 
 ## Graph
   * [Bellman Ford](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/graph/bellman_ford.ts)
+  * [Bipartite Graph](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/graph/bipartite_graph.ts)
   * [Dijkstra](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/graph/dijkstra.ts)
   * [Floyd Warshall](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/graph/floyd_warshall.ts)
   * [Johnson](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/graph/johnson.ts)
@@ -81,6 +87,7 @@
   * [Prim](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/graph/prim.ts)
   * Test
     * [Bellman Ford.Test](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/graph/test/bellman_ford.test.ts)
+    * [Bipartite Graph.Test](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/graph/test/bipartite_graph.test.ts)
     * [Dijkstra.Test](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/graph/test/dijkstra.test.ts)
     * [Floyd Warshall.Test](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/graph/test/floyd_warshall.test.ts)
     * [Johnson.Test](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/graph/test/johnson.test.ts)
@@ -101,6 +108,7 @@
   * [Factors](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/maths/factors.ts)
   * [Fibonacci](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/maths/fibonacci.ts)
   * [Find Min](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/maths/find_min.ts)
+  * [Gaussian Elimination](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/maths/gaussian_elimination.ts)
   * [Greatest Common Factor](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/maths/greatest_common_factor.ts)
   * [Hamming Distance](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/maths/hamming_distance.ts)
   * [Is Divisible](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/maths/is_divisible.ts)
@@ -151,9 +159,11 @@
   * [Counting Sort](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/sorts/counting_sort.ts)
   * [Cycle Sort](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/sorts/cycle_sort.ts)
   * [Gnome Sort](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/sorts/gnome_sort.ts)
+  * [Heap Sort](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/sorts/heap_sort.ts)
   * [Insertion Sort](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/sorts/insertion_sort.ts)
   * [Merge Sort](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/sorts/merge_sort.ts)
   * [Quick Select](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/sorts/quick_select.ts)
   * [Quick Sort](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/sorts/quick_sort.ts)
   * [Selection Sort](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/sorts/selection_sort.ts)
   * [Shell Sort](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/sorts/shell_sort.ts)
+  * [Swap Sort](https://github.com/TheAlgorithms/TypeScript/blob/HEAD/sorts/swap_sort.ts)
diff --git a/maths/fibonacci.ts b/maths/fibonacci.ts
index 3d4cb118..4280a083 100644
--- a/maths/fibonacci.ts
+++ b/maths/fibonacci.ts
@@ -10,25 +10,31 @@
  * @see https://en.m.wikipedia.org/wiki/Fibonacci_number
  * @author MohdFaisalBidda <https://github.com/MohdFaisalBidda>
  */
-export const nthFibonacci = (number: number): number => {
-  if (number < 0) {
-    throw 'Number should be greater than 0';
+function* generateFibonacci(): Generator<number> {
+  let a = 0;
+  let b = 1;
+  while (true) {
+    yield a;
+    const c = a + b;
+    a = b;
+    b = c;
   }
+}
+
+export const nthFibonacci = (number: number): number => {
+  if (isNaN(number)) throw new Error('The input needs to be a number');
+  if (!Number.isInteger(number) || number < 0) throw new Error('The input needs to be a non-negative integer');
 
   if (number === 0) {
     return 0;
   }
-
-  let a = 0,
-    b = 1;
-  for (let i = 1; i < number; ++i) {
-    const c = a + b;
-
-    a = b;
-    b = c;
+  
+  const fibonacciGenerator = generateFibonacci();
+  let result = 0;
+  for (let i = 0; i <= number; ++i) {
+    result = fibonacciGenerator.next().value;
   }
-
-  return b;
+  return result;
 };
 
 /**
@@ -70,4 +76,4 @@ const sqrt5 = Math.sqrt(5)
 const phi = (1 + sqrt5) / 2
 const psi = (1 - sqrt5) / 2
 
-export const nthFibonacciUsingFormula = (n : number) => Math.round((phi ** n - psi ** n) / sqrt5)
+export const nthFibonacciUsingFormula = (n : number) => Math.round((phi ** n - psi ** n) / sqrt5)
\ No newline at end of file