Contenu du cours
Introduction to Dart
Introduction to Dart
1. First Acquaintance with Dart
2. Variables and Data Types in Dart
Indexes 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:
Example
Let's print the element at index 1 from the List:
main
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, one can re-write the value of a List item.
main
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
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?
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Section 4. Chapitre 2
