How do I extend a List in Dart?

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I want to create a more specialized list in dart. I can't directly extend List. What are my options?


addAll method - List class - dart:core library, API docs for the List class from the dart:core library, for the Dart programming add(E value) → void: Adds value to the end of this list, extending the length by  extension MyFancyList<T> on List<T> { int get doubleLength => length * 2; List<T> operator - () => reversed.toList(); List<List<T>> split(int at) => <List<T>> [sublist(0, at), sublist(at)]; } The type T is bound based on the static type of the list that the methods are called on.


List class - dart:core library, The index starts from zero and extends up to n-1 where n is the total number of elements in the List. The index is also referred to as the subscript. Lists can be  Say the extensions Ext1 and Ext2 both define a bubbleSort method that applies to your List object, and either there is no clear winner of the conflict, or the one which wins is not the one you


A new way of extending classes was introduced with Dart 2.6. You can now create an extension of List like this:

extension MyCustomList<T> on List<T> {
  // Any methods you want can be added here.
}

The methods you add can be used implicitly, i.e. you can just use them on any List when you have your extension imported. Here is an example from the feature specification:

extension MyFancyList<T> on List<T> {
  int get doubleLength => this.length * 2;
  List<T> operator-() => this.reversed.toList();
  List<List<T>> split(int at) => 
      <List<T>>[this.sublist(0, at), this.sublist(at)];
  List<T> mapToList<R>(R Function(T) convert) => this.map(convert).toList();
}

You can use these new members on any List, e.g. like this:

const list = <String>['some', 'elements'];

list.doubleLength; // Evaluates to 4.

Dart Programming - Lists, How do you convert a map to a list in flutter? Dart List is an ordered collection which maintains the insertion order of the items. Dart List allows duplicates and null values. While an operation on the list is being performed, modifying the list’s length (adding or removing items) will break the operation. Create a List in Dart/Flutter. The example shows you:


The answers to this are pretty outdated, and I'm in the process of doing this for my own project, so I thought I'd help some people out by posting a really clean answer that doesn't involve any overriding or implementing of things.

The quiver package has an extendable List class called DelegatingList that makes extending a list trivial.

class FruitList extends DelegatingList<Fruit> {
    final List<Fruit> _fruits = [];

    List<Fruit> get delegate => _fruits;

    // custom methods
}

Hopefully this helps someone who comes across this question like I did!

Dart/Flutter - Convert Map to List & List to Map, In a future release, the Dart language is adding a new feature, like it's a wrapper class. list.bubbleSort() // Implicitly, like it extends the type. The enumeration list is a comma-separated list of identifiers Each of the symbols in the enumeration list stands for an integer value, one greater than the symbol that precedes it. By default, the value of the first enumeration symbol is 0.


    //list is your given List and iterable is any object in dart that can be iterated
    list.addAll(Iterable)

Dart Programming - Removing List items, /// A specialized double-linked list of elements that extends [LinkedListEntry]. ///. /// This is not a generic data structure. It only accepts elements that extend. Dart supports generic types, like List<int> (a list of integers) or List<dynamic> (a list of objects of any type). Dart supports top-level functions (such as main()), as well as functions tied to a class or object (static and instance methods, respectively). You can also create functions within functions (nested or local functions).


Dart/Flutter List Tutorial with Examples, A list can contain other lists as elements. This is effectively a two-dimensional list or array. Extending DOM elements · Working with custom elements all sublist items contained in it. Take a look at the different possibilities in flatten_list.dart . Python List extend() The extend() method adds all the elements of an iterable (list, tuple, string etc.) to the end of the list.


Dart Extension Methods Fundamentals - Dart, The extend() method adds all the elements of an iterable (list, tuple, string etc.) to the end of the list. As far as i know, Dart doesn’t have an array data type, but instead has a List<datatype> so here streets will be a List<String>. Now we have to check Rule#1 and Rule#2 . This is definitely a map


sdk/linked_list.dart at master · dart-lang/sdk · GitHub, Extending the to-do list We can keep index.html as is and start by adding routing to our main.dart file: // web/main.dart moduleRouteInitializer(Router router,  Python list extend() is an inbuilt function that adds the specified list elements (or any iterable) to the end of the current list. The extend() extends the list by adding all items of the list (passed as an argument) to an end. Understanding Python List Extend. Python list extend() method appends the contents of seq to list.