How to create a List of Lists in Dart - Step by Step Examples

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How to create a List of Lists in Dart ?

Answer

In Dart, you can create a list of lists using the `List>` class and add lists as elements of the outer list.

✐ Examples

1 Create List of Lists

In this example,

We create two inner lists named list1 and list2.
We create an outer list named listOfLists of type List> and initialize it with the inner lists.
Finally, we print the list of lists to standard output.

Dart Program

void main() {
  List<int> list1 = [1, 2, 3];
  List<String> list2 = ['a', 'b', 'c'];
  List<List<dynamic>> listOfLists = [list1, list2];
  print(listOfLists);
}

Output

[[1, 2, 3], [a, b, c]]

2 Create List of Lists with Empty Inner Lists

In this example,

We create an empty outer list named listOfListsEmpty of type List>.
We create two empty inner lists named list3 and list4.
We use the add method to add the inner lists list3 and list4 to the outer list listOfListsEmpty.
Finally, we print the list of lists with empty inner lists to standard output.

Dart Program

void main() {
  List<List<dynamic>> listOfListsEmpty = [];
  List<dynamic> list3 = [];
  List<dynamic> list4 = [];
  listOfListsEmpty.add(list3);
  listOfListsEmpty.add(list4);
  print(listOfListsEmpty);
}

Output

[[], []]

Summary

In this tutorial, we learned How to create a List of Lists in Dart language with well detailed examples.

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How to create a List of Lists in Dart - Step by Step Examples

How to create a List of Lists in Dart ?

Answer

✐ Examples

1 Create List of Lists

Dart Program

Output

2 Create List of Lists with Empty Inner Lists

Dart Program

Output

Summary

More Dart Lists Tutorials