I'm encountering an issue in Dart related to class inheritance and constructors. The error message I'm receiving is: error: The class 'PathWithActionHistory' can't extend 'Path' because 'Path' only has factory constructors (no generative constructors), and 'PathWithActionHistory' has at least one…
I am working on a class PlaybackControl, I use it to create two HTMLElements: PlaybackControlButton: HTMLButtonElement PlaybackControlMenu: HTMLDivElement Now, to initialise the class object, I need three arguments: videoPlayer: HTMLVideoElement playbackRates: PlaybackRates options: PlaybackControlOptions where: type Shortcuts = Record<string, {…
I have an API upon which I mean to do Unit Testing via xUnit and Moq. It had one constructor actually, but I had to add another one for the specific purpose of Testing as per a suggestion by Visual…
I am trying to standardize the logic of a class.clone method so that every child of my abstract class clones the exact same way. I've tried using factory constructors and all sorts of roundabouts but I can't seem to find…
Consider the following TypeScript classes: class A { foo: string; constructor({ foo }: { foo: string }) { this.foo = foo; } equals(other: A) { return this.foo === other.foo; } } class B extends A { bar: number; constructor(b: {…
I have an instance sampleInstance of an unknown class and I need to create a second instance of the same class. Here's what I am doing right now: I look up the class name with sampleInstance.constructor.name. Next, I use eval(`new…
When creating a stateless widget, the constructor is const class MyWidget extends StatelessWidget { const MyWidget({super.key}); @override Widget build(BuildContext context) { return SingleChildScrollView( child: ListView( ), ); } } If I add a ScrollController(), then it is not a const…
I am using VS code when I create List without assigning values ...the compiler throw Error: Couldn't find constructor 'List': I tried to declare fixed length List but error occurs .please one can fix this I am beginner.
class MyClass { constructor(prop1, prop2, prop3, prop4) { this.prop1 = prop1 this.prop2 = prop2 this.prop3 = prop3 this.prop4 = prop4 //prop 50 and so on } } In js, for this type of constructor assigning where all I'm doing is…
I have the following JavaScript classes, where in the onClick method of the Lesson class the lessonObj property is NOT defined, though the init method of the Lesson class is correctly called. How do I have to change the code,…