How to Check if String is Empty in Dart?

Dart – Check if String is Empty

To check if given String is empty in Dart, read isEmpty property of this String. isEmpty is read only property that returns a boolean value of true if the String is empty, or false if the String is not empty.

Syntax

The syntax to read isEmpty property of a string is

String.isEmpty

Examples

Empty String

In this example, we will take an empty String and programmatically check if this string is empty or not.

main.dart

void main() {
  var str = '';
  if (str.isEmpty) {
    print('String is empty.');
  } else {
    print('String is not empty.');
  }
}

Output

String is empty.

Non Empty String

In this example, we will take an non-empty String and programmatically check if this string is empty or not.

main.dart

void main() {
  var str = 'Hello World!';
  if (str.isEmpty) {
    print('String is empty.');
  } else {
    print('String is not empty.');
  }
}

Output

String is not empty.

Conclusion

In this Dart Tutorial, we learned how to check if given string is empty, using isEmpty property of String class object, with examples.