refactor: Renamed js to nodejs

- feat: Added util module

reverse-integer/nodejs/index.js

@@ -17,6 +17,8 @@ Note:
 Assume we are dealing with an environment which could only store integers within the 32-bit signed integer range: [−231,  231 − 1]. For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.
 */
 
+const { assert }  = require('../../util/js'); 
+
 /**
  * @param {number} x
  * @return {number}
@@ -40,18 +42,21 @@ const reverse = function(x) {
  * Output: 321
  */
 x = 123;
-console.log(reverse(x));
+sol = 321;
+assert(reverse(x) === sol, 'Output: 321');
 
 /* Test Case 2
  * Input: -123
  * Output: -321
  */
 x = -123;
-console.log(reverse(x));
+sol = -321
+assert(reverse(x) === sol, 'Output: -321');
 
 /* Test Case 3
  * Input: 120
  * Output: 21
  */
 x = 120;
-console.log(reverse(x));
+sol = 21;
+assert(reverse(x) == sol, 'Output: 21');