Dart Loops

There are three kinds of looping statements in Dart. They are

  • While Loop
  • Do-while Loop
  • For Loop

Also, there are some statements that can control the execution of these loop statements. They are called loop-control statements. They are

  • break
  • continue

While Loop

Refer Dart While Loop tutorial, where a detailed syntax and examples are provided.

The following is a simple example of while loop statement in Dart.

main.dart

void main() {
  var i = 0;
  while (i < 5) {
    print('Hello World');
    i++;
  }
}

Output

Hello World
Hello World
Hello World
Hello World
Hello World
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Do-While Loop

Refer Dart Do-While Loop tutorial, where a detailed syntax and examples are provided.

The following is a simple example of do-while loop statement in Dart.

main.dart

void main() {
  var i = 0;
  do {
    print('Hello World');
    i++;
  } while (i < 5);
}

Output

Hello World
Hello World
Hello World
Hello World
Hello World

For Loop

Refer Dart For Loop tutorial, where a detailed syntax and examples are provided.

The following is a simple example of For loop statement in Dart that find the factorial of n.

Dart program

void main(){
	var n = 6;
	var factorial = 1;
	
	//for loop to calculate factorial
	for(var i=2; i<=n; i++) {
		factorial = factorial*i;
	}
	
	print('Factorial of ${n} is ${factorial}');
}

Output

Factorial of 6 is 720

Continue Statement

In this example, we print numbers from 1 to 7 using while loop. But when i=5, we skip the iteration, continue with the next iteration.

Refer Dart Continue tutorial for more examples of using continue statement.

main.dart

void main() {
  var i = 0;
  while (i < 7) {
    i++;
    if (i == 5) {
      continue;
    }
    print(i);
  }
}

Output

1
2
3
4
6
7

Break Statement

In this example, we print numbers from 1 to 7 using while loop. But when i=5, we break the loop using break statement.

Refer Dart Break tutorial for more examples of using break statement.

main.dart

void main() {
  var i = 0;
  while (i < 7) {
    i++;
    if (i == 5) {
      break;
    }
    print(i);
  }
}

Output

1
2
3
4

Conclusion

In this Dart Tutorial, we have learnt about different loop statements, and loop control statements in Dart language, with examples.