Flutter: List is deprecated?

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 = [];

Answer 4

old version

 List<Widget> widgetList = new List<Widget>();

new version

List<Widget> widgetList = [];