feat(commas):added extension methods

README.md

@@ -50,6 +50,9 @@ addCommas('۸۲۳۳۴۵'); // 823,345
 
 removeCommas('654,562'); // 654562
 removeCommas('3,365.255'); // 3365.255
+
+'11222'.addComma // 11,222
+'4,544.562'.removeComma // 4544.562
 ```
 
 - #### Converting Persian numbers to Arabic / English numbers and reverse - [source](https://github.com/persian-tools/dart-persian-tools/blob/master/lib/src/core/digits/methods.dart)

example/example_commas_methods.dart

@@ -6,4 +6,7 @@ void main() {
 
   print(removeCommas('654,562')); // 654562
   print(removeCommas('3,365.255')); // 3365.255
+
+  print('11222'.addComma); // 11,222
+  print('4,544.562'.removeComma); // 4544.562
 }

lib/src/core/commas/methods.dart

@@ -33,3 +33,10 @@ num removeCommas(String number) {
   }
   return num.parse(number);
 }
+
+/// Extension wrapper for functions
+extension Commas on String {
+  String get addComma => addCommas(this);
+
+  num get removeComma => removeCommas(this);
+}

test/test_commas.dart

@@ -21,5 +21,9 @@ void main() {
       expect(removeCommas('30,000,000'), equals(30000000));
       expect(removeCommas('300'), equals(300));
     });
+    test('extension methods', () {
+      expect('522642'.addComma, equals('522,642'));
+      expect('56,555.978'.removeComma, equals(56555.978));
+    });
   });
 }