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Introduction to Dart

bookList 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<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:

main.dart

main.dart

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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.

main.dart

main.dart

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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]
}

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

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.
main.dart

main.dart

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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:

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

Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 2. ChapterΒ 6

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bookList in Dart

Swipe to show menu

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<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:

main.dart

main.dart

copy

              
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.

main.dart

main.dart

copy

              
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]
}

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

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.
main.dart

main.dart

copy

              
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:

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

Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 2. ChapterΒ 6
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