/Dart/Dart he default constructor is already defined. Try giving one of the constructors a name.

Dart he default constructor is already defined. Try giving one of the constructors a name.

In dart you can not have the same method/constructor name used several times 
(even with different parameters).

In your case you can either use named constructor to define 2 constructors :

class FirstClass {
  FirstClass() {}
  FirstClass.withA(a) {}
}

Source: stackoverflow.com

Similar codes

0 vote150 views1 answer
Flutter leading
Dart
1 vote163 views1 answer
Flutter+return no widget
Dart
0 vote148 views2 answers
Add a clickable link in flutter
Dart
1 vote142 views1 answer
Flutter async initstate
Dart
9 votes147 views5 answers
Psycopg2
Dart
6 votes152 views3 answers
Get random color in flutter
Dart
1 vote141 views1 answer
Flutter slider color
Dart
1 vote151 views1 answer
Slice string dart syntax
Dart
1 vote152 views1 answer
Sort list descending from spesific maps key in dart
Dart
1 vote164 views1 answer
Flutter await http.get timeout
Dart