Dart Variables

A variable is a named stored value in a program. Dart uses var for a value that can change and final for a value that cannot change.

var gives days the value 7. print shows the stored number.

void main() {
  var days = 7;
  print(days);
}

The two print lines show count before and after the change. The count grows from 1 to 2 in the output.

void main() {
  var count = 1;
  print(count);
  count = 2;
  print(count);
}

final gives city the text value York. print shows the stored text.

void main() {
  final city = 'York';
  print(city);
}

The last line tries to give limit a new value. Dart stops and names final in its error.

void main() {
  final limit = 5;
  limit = 6;
}

Example

void main() {
  var score = 10;
  print(score);
  score = 15;
  print(score);
}

In this example, var score starts with the value 10. The first print shows 10. The next line changes score to 15. The last print shows 15.

Edit the code, then press Run.

Running is simulated · DartPad

void main() {
  var score = 10;
  print(score);
  score = 15;
  print(score);
}

Which keyword names a value that can change?

final var print main