Contenu du cours
Introduction to Dart
Introduction to Dart
1. First Acquaintance with Dart
2. Variables and Data Types in Dart
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:
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 1
Example of creating a List with int values:
main
List<int> numbers = [1, 2, 3, 4, 5];
Listof integer numbers;<int>type elements fromList.
Adding Items
Let's add a value to the already existing list of numbers.
main
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] }
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
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.
main
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
Task
We heva a List
Tout était clair ?
Merci pour vos commentaires !
Section 4. Chapitre 1
