Dart check if many variable is null-CodePudding

Hello im new in dart language, is someone can help me to write this condition better, it works but it's a lot repetitive and i feel theres a better ways to write it :

 if (var1 != null || var2 != null || var3 != null || var4 != null || var5 != null){ ShowMyWidget }

thank you.

CodePudding user response：

Rather than checking all those variables, I'd make them optional parameters to the widget. If you do that, you can just check if they're null using null-safety inside it, whenever you actually need them.

class TestWidget extends StatelessWidget {
  final String? testPar1;
  final String? testPar2;
  final String? testPar3;
  final String? testPar4;
  const TestWidget({
    this.testPar1,
    this.testPar2,
    this.testPar3,
    this.testPar4,
    Key? key,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Text(testPar1 ?? 'nope'),
        Text(testPar2 ?? 'nope'),
        Text(testPar3 ?? 'nope'),
        Text(testPar4 ?? 'nope'),
      ],
    );
  }
}

Keep in mind that your way of doing it isn't wrong.

CodePudding user response：

If you really want, you could do:

if ([var1, var2, var3, var4, var5].any((x) => x != null)) {
  ShowMyWidget();
}