If you truly think this variable can be null then you would change the type by adding a ? after it so that the required keyword is not needed, or you can add a default value to the parameter. The @required annotation marks named arguments that must be passed; if not, the analyzer reports a hint.
Read moreWhat is the difference between required and @required Flutter?
If you truly think this variable can be null then you would change the type by adding a ? after it so that the required keyword is not needed, or you can add a default value to the parameter. The @required annotation marks named arguments that must be passed; if not, the analyzer reports a hint.
Read moreWhy do we create constructors in Flutter?
Constructor is a special method of Dart class which is automatically called when the object is created. The constructor is like a function with/without parameter but it doesn’t have a return type. Now you can create new object using a constructor.16 Mar 2022
Read moreWhy do we pass functions to widgets in flutter?
Functions are first-class objects in Dart and can be passed as parameters to other functions. We pass a function to a widget essentially saying, invoke this function when something happens . Callbacks using interfaces like Android have too much boilerplate code for a simple callback.
Read moreHow do you pass a function flutter?
Dart: How to pass a function into a function (using a Function as a method parameter)
Read moreHow do you pass parameters in flutter?
You can accomplish this task using the arguments parameter of the Navigator.
Read moreWhat is a void function example?
Functions like this are called void, and they return None, Python’s special object for “nothing”. Here’s an example of a void function: >>> def sayhello(who): print ‘Hello,’, who + ‘!’ print ‘What a lovely day.
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