Notice: This page requires JavaScript to function properly.
Please enable JavaScript in your browser settings or update your browser.
Apprendre List in Dart | Variables and Data Types in Dart
Introduction to Dart

book
List in Dart

Lists can be useful for:

  • Storing data about a list of things, such as a shopping list, a to-do list, or a contact list;
  • Storing data about a sequence of events, such as a history list or a list of steps that need to be taken to complete a task.

Syntax

Let's look at the scheme of creating a List:

dart
List<elements_type> list_name = [element_1, element_2];
  • List: command to create a list;
  • <elements_type>: the data type for values will be stored in the middle of the list;
  • list_name: list name;
  • [element_1, element_2]: commas (,) separate the list elements.

Example

Example of creating a List with int values:

dart

main

copy
List<int> numbers = [1, 2, 3, 4, 5];
1
List<int> numbers = [1, 2, 3, 4, 5];
  • List of integer numbers;
  • <int> type elements from List.

Adding Items

Let's add a value to the already existing list of numbers.

dart

main

copy
void main() {
List<int> numbers = [111, 22, 32];
print(numbers); // Output [111, 22, 32]
numbers.add(6); // Adding an item to a list
print(numbers); // Output [111, 22, 32, 6]
}
123456
void main() { List<int> numbers = [111, 22, 32]; print(numbers); // Output [111, 22, 32] numbers.add(6); // Adding an item to a list print(numbers); // Output [111, 22, 32, 6] }
dart
numbers.add(6);

Let's break down the new command in detail:

  • numbers: list name;
  • add(): command that adds elements to a list;
  • 6: the value we want to add to the list.

Deleting Items

dart
list_name.remove(element)

Let's break down the new command in detail:

  • numbers: list name;
  • remove(): command that removes the first occurrence of the specified item in the list;
  • element: the value we want to add to the list.
dart

main

copy
void main() {
List<int> numbers = [11, 22, 23];
print(numbers); // [11, 22, 23]
numbers.remove(22);
print(numbers); // [11, 23]
}
123456
void main() { List<int> numbers = [11, 22, 23]; print(numbers); // [11, 22, 23] numbers.remove(22); print(numbers); // [11, 23] }

We removed 22 from the List

We heva a List:

dart
List<bool> items = [true, false];
question-icon

Remove the value true from the List items

_ _ _
.
_ _ _
_ _ _
;

Click or drag`n`drop items and fill in the blanks

dots
(true)
dots
remove
dots
items
Tout était clair ?

Comment pouvons-nous l'améliorer ?

Merci pour vos commentaires !

Section 2. Chapitre 6
We use cookies to make your experience better!
some-alt