Missing Number in javascript done

Author: kirttinath-ojha

MissingNumber.js

@@ -0,0 +1,9 @@
+function findMissingNumber(inputArray, length) {
+    let result = Math.floor((length + 1) * (length + 2) / 2);
+    for (let i = 0; i < length; i++) result -= inputArray[i];
+    return result;
+   }
+  
+   let myArray = [1, 2, 3, 5];
+   let missingNumber = findMissingNumber(myArray, myArray.length);
+ console.log(missingNumber);