Vandad Nahavandipoor on Twitter: "Did you know that in #Dart, you can #extend #functions? 🤯Any function defined with a #typedef can be extended. Here I show you how to turn an "onPressed" #
![flutter - Null Related Error - The argument type 'String? Function(String)' can't be assigned to the parameter type 'String? Function(String?)?' - Stack Overflow flutter - Null Related Error - The argument type 'String? Function(String)' can't be assigned to the parameter type 'String? Function(String?)?' - Stack Overflow](https://i.stack.imgur.com/lvul3.png)
flutter - Null Related Error - The argument type 'String? Function(String)' can't be assigned to the parameter type 'String? Function(String?)?' - Stack Overflow
![flutter - Null Related Error - The argument type 'String? Function(String)' can't be assigned to the parameter type 'String? Function(String?)?' - Stack Overflow flutter - Null Related Error - The argument type 'String? Function(String)' can't be assigned to the parameter type 'String? Function(String?)?' - Stack Overflow](https://i.stack.imgur.com/JMYgl.png)
flutter - Null Related Error - The argument type 'String? Function(String)' can't be assigned to the parameter type 'String? Function(String?)?' - Stack Overflow
![Andrea Bizzotto 💙 on Twitter: "In Dart/Flutter, you can make it *explicit* when a function can return an error with the Either type from the fpdart package. For example, parsing a double Andrea Bizzotto 💙 on Twitter: "In Dart/Flutter, you can make it *explicit* when a function can return an error with the Either type from the fpdart package. For example, parsing a double](https://pbs.twimg.com/media/FZLCdqLXEAElFOg.png)
Andrea Bizzotto 💙 on Twitter: "In Dart/Flutter, you can make it *explicit* when a function can return an error with the Either type from the fpdart package. For example, parsing a double
![dart - Flutter: The argument type 'HomePage Function(BuildContext, Map<String, dynamic>)' can't be assigned to the parameter type - Stack Overflow dart - Flutter: The argument type 'HomePage Function(BuildContext, Map<String, dynamic>)' can't be assigned to the parameter type - Stack Overflow](https://i.stack.imgur.com/vikbm.png)