Final Variables

Part of the Fundamentals section of Coddy's Dart journey — lesson 11 of 94.

In Dart, final variables cannot be changed after initialization. They create constants in your program.

void main() {
  final name = 'Dart Programmer';
  print(name);
}

You can specify types or let Dart infer them. Attempting to reassign final variables causes errors:

void main() {
  final score = 100;
  // score = 200;  // Error: Can't reassign final variables
}

Challenge

Beginner

In this challenge, you'll learn about final variables in Dart. A final variable can only be set once and cannot be changed after initialization.

Complete the following tasks:

Create a final integer variable named releaseYear with the value 2011 (the year Dart was first released)
Create a final string variable named creator with the value "Google"
Create a final boolean variable named isCompiledLanguage with the value true
Print all three variables with descriptive labels exactly as shown in the expected output

Your output should look exactly like this:

Dart was released in: 2011
Dart was created by: Google
Is Dart a compiled language? true

Cheat sheet

In Dart, final variables cannot be changed after initialization. They create constants in your program.

final name = 'Dart Programmer';
final score = 100;

You can specify types or let Dart infer them. Attempting to reassign final variables causes errors:

final score = 100;
// score = 200;  // Error: Can't reassign final variables

Try it yourself

void main() {
  // Declare your final variables here
  final int releaseYear = ?;
  final String creator = ?;
  final bool isCompiledLanguage = ?;
  
  // Print the variables with labels
  print("Dart was released in: " + releaseYear.toString());
  print("Dart was created by: " + creator);
  print("Is Dart a compiled language? " + isCompiledLanguage.toString());
}