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content/dart/concepts/queue/terms/isEmpty/isEmpty.md

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+---
+Title: '.isEmpty'
+Description: 'Returns true if the queue contains no elements, otherwise returns false.'
+Subjects:
+  - 'Computer Science'
+  - 'Code Foundations'
+Tags:
+  - 'Dart'
+  - 'Queues'
+  - 'Properties'
+CatalogContent:
+  - 'learn-dart'
+  - 'paths/computer-science'
+---
+
+In Dart, **`.isEmpty`** is a property used to check whether a `Queue` contains any elements. It returns `true` if the queue has zero elements and `false` if it contains one or more elements. This property is available on the `Queue` class from the `dart:collection` library.
+
+## Syntax
+
+```pseudo
+queue.isEmpty
+```
+
+- `queue`: The name of the queue to check for emptiness.
+
+**Parameters:**
+
+This property takes no parameters.
+
+**Return value:**
+
+The property returns a boolean value:
+
+- `true` if the queue contains no elements
+- `false` if the queue contains one or more elements
+
+## Example
+
+This example shows that `.isEmpty` returns `true` for an empty queue and `false` after elements are added:
+
+```dart
+import 'dart:collection';
+
+void main() {
+  Queue values = new Queue();
+
+  print('Is queue empty? ${values.isEmpty}');
+
+  values.add(12);
+  values.add(24);
+  values.add(36);
+
+  print('Is queue empty? ${values.isEmpty}');
+  print('Number of elements: ${values.length}');
+
+  for(var num in values) {
+    print(num);
+  }
+}
+```
+
+The output of this code is:
+
+```shell
+Is queue empty? true
+Is queue empty? false
+Number of elements: 3
+12
+24
+36
+```