Update 1603-design-parking-system.js

Added comments above each if stetment.

Author: aadil42

javascript/1603-design-parking-system.js

@@ -18,18 +18,25 @@ class ParkingSystem {
    * @return {boolean}
    */
   addCar(carType) {
+    // If carType is 1 (big) and there are available big parking spaces
     if (carType === 1 && this.bigRemaining > 0) {
       this.bigRemaining -= 1;
       return true;
     }
+
+    // If carType is 2 (medium) and there are available medium parking spaces
     if (carType === 2 && this.mediumRemaining > 0) {
       this.mediumRemaining -= 1;
       return true;
     }
+
+    // If carType is 3 (small) and there are available small parking spaces
     if (carType === 3 && this.smallRemaining > 0) {
       this.smallRemaining -= 1;
       return true;
     }
+
+    // If no suitable parking space is available for the given carType
     return false;
   }
 }