Added two very basic TypeScript Algorithms

Binary Search/binary_search.ts

@@ -0,0 +1,22 @@
+const binarySearch = (
+  nums: number[],
+  s: number,
+  start: number = 0,
+  end: number = nums.length - 1,
+): number => {
+  const mid = Math.floor((start + end) / 2);
+
+  if (nums[mid] === s) {
+    return mid;
+  }
+
+  if (nums[mid] > s) {
+    return binarySearch(nums, s, start, mid - 1);
+  }
+
+  if (nums[mid] < s) {
+    return binarySearch(nums, s, mid + 1, end);
+  }
+
+  return -1;
+};

HappyNumber/HappyNumber.ts

@@ -0,0 +1,26 @@
+/*
+ *  Some numbers are happy. Well they're only happy if sum of squares
+ *  of their digits ends up as 1!
+ */
+
+function isHappy(n: number): boolean {
+	if (n == 1 || n == 7) return true;
+
+	let sum: number = n;
+
+  	while (sum > 9) {
+  		sum = sum
+      		.toString()
+      		.split('')
+      		.map((digit) => {
+      			return Number(digit);
+      		})
+      		.reduce((partialSum, a) => Math.pow(a, 2) + partialSum, 0);
+
+    	if (sum == 1 || sum == 7) {
+      		return true;
+    	}
+	}
+
+  	return false;
+}

HappyNumber/Readme.md

@@ -7,21 +7,22 @@ A happy number is a number defined by the following process:
  - Starting with any positive integer, replace the number by the sum of the squares of its digits.
  - Repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1.
  - Those numbers for which this process ends in 1 are happy.
-
- Example 1:
 
-Input:<br> n = 19 <br>
 <br>
-Output:<br> true <br>
+Example:
+> *Input*: `n = 19`
 <br>
-Explanation: <br>
+*Output:* `true`
+<br>
+*Explanation:* <br>
 1<sup>2</sup> + 9<sup>2</sup> = 82 <br>
 8<sup>2</sup> + 2<sup>2</sup> = 68 <br>
 6<sup>2</sup> + 8<sup>2</sup> = 100 <br>
-1<sup>2</sup> + 0<sup>2</sup> + 0<sup>2</sup> = 1 
+1<sup>2</sup> + 0<sup>2</sup> + 0<sup>2</sup> = 1
 
 
 ## References
 
-[1] [Check whether a number is happy](https://leetcode.com/problems/happy-number/)
+[Happy Number LeetCode Problem](https://leetcode.com/problems/happy-number/)
 
+[GeeksForGeeks Article on Happy Number](https://www.geeksforgeeks.org/happy-number/)