Вивчайте Indexes in Dart | Variables and Data Types in Dart

Every element in a List or String has a unique address called an index. Indexes start from 0 the first element has index 0, the second has index 1, and so on.

You can retrieve an element from the list using its index with the following syntax.

main.dart


              1234
            
void main() {
  List<String> names = ["Bob", "John"];
  print(names[1]); // John 
}

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


              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"]. A String also have indexes.

main.dart


              1234
            
void main() {
  String  user = "Alex";
  print(user[0]);
}

Note

The only difference between Indexes in a String and Indexes in a List is that in lists, we can update values at those addresses, whereas in strings, we cannot.

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

2. What will the following code output?

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Every element in a List or String has a unique address called an index. Indexes start from 0 the first element has index 0, the second has index 1, and so on.

You can retrieve an element from the list using its index with the following syntax.

main.dart


              1234
            
void main() {
  List<String> names = ["Bob", "John"];
  print(names[1]); // John 
}

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


              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"]. A String also have indexes.

main.dart


              1234
            
void main() {
  String  user = "Alex";
  print(user[0]);
}

Note

The only difference between Indexes in a String and Indexes in a List is that in lists, we can update values at those addresses, whereas in strings, we cannot.

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

2. What will the following code output?

Все було зрозуміло?

Дякуємо за ваш відгук!

Секція 2. Розділ 7