Function Builder Not Working When Only One Value

Function Builder not working when only one value?

Any idea?

What is happening in the failing case is that { 10 } is being treated as a closure of type () -> Int directly and the compiler doesn't appear to consider the function builder at all. The code that is produced is simply a function which returns 10.

This appears to a "feature" where the recognition of { 10 } as a simple closure overrides its possible recognition as a use of the function builder. This may just be a compiler issue or worse it might be a language definition problem...

Please head to feedbackassistant.apple.com and file a report.

@_functionBuilder problem with initializer when there is less than 2 items

I have found a partial but usable answer!

For the single row section I just have to add this initializer:

extension Section {
    init(@SectionBuilder _ content: () -> Row) {
        self.init(rows: [content()])
    }
}

Unfortunately, it doesn't work when I have no row with this one:

extension Section {
    init(@SectionBuilder _ content: () -> Void) {
        self.init(rows: [])
    }
}

let section0 = Section { } // Cannot invoke initializer for type 'Section' with an argument list of type '(@escaping () -> ())'

So I tried with an escaping closure:

extension Section {
    init(@SectionBuilder _ content: @escaping () -> Void) {
        self.init(rows: [])
    }
}

let section0 = Section { } // Expression type 'Section' is ambiguous without more context

So, as it is merely for syntactic sugar that I use this DSL notation, I can go with:

extension Section {
    init() {
        self.init(rows: [])
    }
}

let section0 = Section()

Listview.builder with stateful item is not working properly

Try this, in your CartComponent add this:

final Function(String) onDelete;

and in press button:

onPressed: () {
                widget.onDelete(widget.value);
              },

and in ListView builder do this:

ListView.builder(
        itemCount: list.length,
        itemBuilder: (context, index) {
          return CartComponent(
            key: UniqueKey(), // the very important part 
            value: list[index],
            onDelete: (value) {
              setState(() {
                list.remove(value);
              });
            },
          );
        },
      )

Why this function doesn't actualize user value?

You will need to call following method (FirebaseFirestore.instance.collection('users').doc(id).get()) in main thread using await and convert getUserDataById to future and call this method with await.

Function returns NA while function builder returns proper answer

The =MATCH(1,((A1:A3=A2)*(A1:A3=A2)),0) formula is an array formula¹ and must be finalized with Ctrl+Shift+Enter↵ (aka CSE) all struck together on the keyboard. If entered correctly, Excel with wrap the formula in braces (e.g. { and }). You do not type these in yourself.

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¹ _{Array formulas need to be finalized with Ctrl+Shift+Enter↵. Once entered into the first cell correctly, they can be filled or copied down or right just like any other formula. Try and reduce your full-column references to ranges more closely representing the extents of your actual data. Array formulas chew up calculation cycles logarithmically so it is good practise to narrow the referenced ranges to a minimum. See Guidelines and examples of array formulas for more information.}

Why is my future builder still not working in spite of await in flutter?

In your FutureBuilder you have the condition wrong, (snapshot.hasData != null) is always true, it should be like this:

FutureBuilder(
                future: widgetLoadingFunctions(_selectedIndex),
                builder: (BuildContext context, AsyncSnapshot snapshot) {
                  if (snapshot.hasData) {
                    return widgetOptions(_selectedIndex);
                  } else
                    return CircularProgressIndicator();
                })),

or like this:

FutureBuilder(
                future: widgetLoadingFunctions(_selectedIndex),
                builder: (BuildContext context, AsyncSnapshot snapshot) {
                  if (snapshot.data != null) {
                    return widgetOptions(_selectedIndex);
                  } else
                    return CircularProgressIndicator();
                })),

Future Builder is Not Building

You don't need to change FutureBuilder it is good. And I recode your getVerified() function.

Can you try

Future<bool> getVerified() async {
  debugPrint('>> Home: getVerified Started');
  bool isVerified = false; // set your response to false

  // get your user
  final user = FirebaseAuth.instance.currentUser;

  // check the data from firestore if the user is not null
  if (user != null) {
    final docSnapShot = await FirebaseFirestore.instance
        .collection('users')
        .doc(user.uid)
        .get();

    if (docSnapShot.exists) {
      isVerified = docSnapShot.data()!['isVerified'];
    }
  }

  debugPrint(
      '>> Home: getVerified $isVerified'); // this variable is currently true or false
  return isVerified; // this will return Instance of '_Future'
}

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