相关疑难解决方法(0)

I am very new to Dart/Flutter and I have a confusion regarding the => notation. The documentation says that the => notation is used as a shorthand to return a single expression.

bool isNoble(int atomicNumber) => _nobleGases[atomicNumber] != null;

My doubt comes when I am trying to set state in a flutter application.

RaisedButton(
  onPressed: () => {
    setState(() {
      print('hello');
      _products.add('More stuff');
    })
  },
  child: Text('Add Product'),
),

Now when i change the setState method with => notation

RaisedButton( …