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Introduction to Dart

bookIndexes in Dart

Every element in the List, or String, has a unique address. Such addresses are called indexes:

Indexes start from 0. The first element is assigned the index 0, the second element is assigned the index 1, and so on.

We can retrieve an element from the list using its index with the following syntax:

listName[index]

Example

Let's print the element at index 1 from the List:

main.dart

main.dart

copy

              
1234

            
void main() {
  List<String> names = ["Bob", "John"];
  print(names[1]); // John 
}

Editing

Dart allows modifying the value of an item in a List. In other words, you can re-write the value of a List item.

main.dart

main.dart

copy

              
12345

            
void main() {
  List cars = ["BMW", "Porsche", "Ford"];
  cars[0] = "Toyota";
  print(cars); // ["Toyota", "Porsche", "Ford"]
}

The above example updates the value of the List item with index 0. The output of the code will be − ["Toyota", "Porsche", "Ford"].

String Indexes

In a String, we also have indexes.

main.dart

main.dart

copy

              
1234

            
void main() {
  String  user = "Alex";
  print(user[0]);
}

1. Select the element at index 1 in the string 'Codefinity'.

2. What will the following code output?

question mark

Select the element at index 1 in the string 'Codefinity'.

Select the correct answer

question mark

What will the following code output?

Select the correct answer

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Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 2. Kapitel 7

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bookIndexes in Dart

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Every element in the List, or String, has a unique address. Such addresses are called indexes:

Indexes start from 0. The first element is assigned the index 0, the second element is assigned the index 1, and so on.

We can retrieve an element from the list using its index with the following syntax:

listName[index]

Example

Let's print the element at index 1 from the List:

main.dart

main.dart

copy

              
1234

            
void main() {
  List<String> names = ["Bob", "John"];
  print(names[1]); // John 
}

Editing

Dart allows modifying the value of an item in a List. In other words, you can re-write the value of a List item.

main.dart

main.dart

copy

              
12345

            
void main() {
  List cars = ["BMW", "Porsche", "Ford"];
  cars[0] = "Toyota";
  print(cars); // ["Toyota", "Porsche", "Ford"]
}

The above example updates the value of the List item with index 0. The output of the code will be − ["Toyota", "Porsche", "Ford"].

String Indexes

In a String, we also have indexes.

main.dart

main.dart

copy

              
1234

            
void main() {
  String  user = "Alex";
  print(user[0]);
}

1. Select the element at index 1 in the string 'Codefinity'.

2. What will the following code output?

question mark

Select the element at index 1 in the string 'Codefinity'.

Select the correct answer

question mark

What will the following code output?

Select the correct answer

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 2. Kapitel 7
some-alt