List
About List
A List
in the Dart programming language is an inherent data type that represents an ordered collection of elements. Each element within a List
should typically have the same data type, whether it's integers, floating-point numbers, strings, or other objects.
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.dart
List
of integer numbers;<int>
type elements fromList
.
Example 2
Frequently, we initialize an empty List
with the intention of populating it with data that we will acquire at a later point, such as input from a user.
main.dart
An empty List
for bool
values was created above.
Adding Items
Let's add a value to the already existing list of numbers.
main.dart
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
The remove()
function removes the first occurrence of the specified item in the list.
main.dart
We removed 22
from the List
Task
We heva a List
¿Todo estuvo claro?
Contenido del Curso
Introduction to Dart
1. First Acquaintance with Dart
2. Variables and Data Types
3. Conditional Statements
4. List and String
Introduction to Dart
List
About List
A List
in the Dart programming language is an inherent data type that represents an ordered collection of elements. Each element within a List
should typically have the same data type, whether it's integers, floating-point numbers, strings, or other objects.
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.dart
List
of integer numbers;<int>
type elements fromList
.
Example 2
Frequently, we initialize an empty List
with the intention of populating it with data that we will acquire at a later point, such as input from a user.
main.dart
An empty List
for bool
values was created above.
Adding Items
Let's add a value to the already existing list of numbers.
main.dart
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
The remove()
function removes the first occurrence of the specified item in the list.
main.dart
We removed 22
from the List
Task
We heva a List
¿Todo estuvo claro?