Flutter: List is deprecated? [duplicate]

Question

After upgrading to the latest version of flutter, I get a deprecation warning for all my Lists.

List<MyClass> _files = List<MyClass>();
=>'List' is deprecated and shouldn't be used.

Unfortunately, it does not give a hint of what to replace it with. So what are we supposed to use instead now?

• Dart SDK version: 2.12.0-141.0.dev
• Flutter: Channel master, 1.25.0-9.0.pre.42

Answer 1

Ok found it, it's just how to instantiate it:

List<MyClass> _files = []; 

Edit: maybe the most common ones, a bit more detailed according to the docs:

Fixed-length list of size 0

List<MyClass> _list = List<MyClass>.empty(); 

Growable list

List<MyClass> _list = []; //or List<MyClass> _list = List<MyClass>.empty(growable: true); 

Fixed length with predefined fill

int length = 3; String fill = "test"; List<String> _list =  List<String>.filled(length ,fill , growable: true); // => ["test", "test", "test"] 

List with generate function

int length = 3; MyClass myFun(int idx) => MyClass(id: idx); List<MyClass> _list = List.generate(length, myFun, growable: true);  // => [Instance of 'MyClass', Instance of 'MyClass', Instance of 'MyClass'] 

Answer 2

List<MyClass> myList = <MyClass>[];

Answer 3

From:

_todoList = new List();

Change to:

_todoList = [];