How to initialize list of custom object with no constructor [Dart/Flutter]

Question

I've been facing this issue, I have a mock class with static values for testing. but I am unable to create a list for custom Object class which has no constructor as following.

class Video { 
  
  Video();  //this is default constructor

  late int id;
  late String name;
}

Problem: Now I want to initialize a static list.

final List<Video> videos = [
  new Video({id = 1, name = ""}) //but this gives an error. 
];

I don't want to change class constructor.

Is there any way to initialize list of custom class without constructor?

var videos = [Video()..id = 1..name = ''];. However, you really should fix the class constructor, especially with late variables. — jamesdlin
– jamesdlin, Commented Feb 12, 2022 at 8:15

dumazy · Accepted Answer · 2022-02-12 08:18:54Z

1

Technically, this would work:

final List<Video> videos = [
  Video()..id = 1..name = '',
  Video()..id = 2..name = 'another',
];

You basically assign the late properties after creating the Video instance, but before it's in the list.

However, it's likely that you don't need those properties to be late-initizalized and rather use a constructor for it

class Video { 
  
  Video({required this.id, required this.name}); 

  int id;
  String name;
}

final List<Video> videos = [
  Video(id: 1, name: ''),
  Video(id: 2, name: 'another'),
];

But that depends on your use case, of course

answered Feb 12, 2022 at 8:18

dumazy

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1 Comment

Sayed M. Idrees Over a year ago

Thanks @dumazy, the double dots annotation worked for me in this case.

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