Dart Map isNotEmpty
Syntax & Examples

Syntax of Map.isNotEmpty

The syntax of Map.isNotEmpty property is:

 bool isNotEmpty

This isNotEmpty property of Map whether there is at least one key/value pair in the map.

Return Type

Map.isNotEmpty returns value of type bool.


✐ Examples

1 Check if map is not empty

In this example,

  1. We create a map named map1 with key/value pairs {'apple': 1, 'banana': 2, 'cherry': 3}.
  2. We then check if the map is not empty using the isNotEmpty property.
  3. We print the result to standard output.

Dart Program

void main() {
  Map<String, int> map1 = {'apple': 1, 'banana': 2, 'cherry': 3};
  bool notEmpty = map1.isNotEmpty;
  print('Map is not empty: $notEmpty');
}

Output

Map is not empty: true

2 Check if empty map is not empty

In this example,

  1. We create an empty map named map2.
  2. We then check if the map is not empty using the isNotEmpty property.
  3. We print the result to standard output.

Dart Program

void main() {
  Map<int, String> map2 = {};
  bool notEmpty = map2.isNotEmpty;
  print('Map is not empty: $notEmpty');
}

Output

Map is not empty: false

3 Check if map with single entry is not empty

In this example,

  1. We create a map named map3 with a single key/value pair {'name': 'John'}.
  2. We then check if the map is not empty using the isNotEmpty property.
  3. We print the result to standard output.

Dart Program

void main() {
  Map<String, String> map3 = {'name': 'John'};
  bool notEmpty = map3.isNotEmpty;
  print('Map is not empty: $notEmpty');
}

Output

Map is not empty: true

Summary

In this Dart tutorial, we learned about isNotEmpty property of Map: the syntax and few working examples with output and detailed explanation for each example.