How to check if a Set is Empty in Dart

How to check if a Set is Empty in Dart ?

Answer

To check if a Set is empty in Dart, you can use the isEmpty property or the length property.


✐ Examples

1 Check if Set is Empty Using isEmpty Property

In this example,

  1. We define a set named `mySet` containing elements of a specific type.
  2. We check if the set is empty using the `isEmpty` property.
  3. If the `isEmpty` property returns `true`, then the set is empty; otherwise, it contains elements.

Dart Program

// Define set
Set<String> mySet = {};

// Check if set is empty using isEmpty property
if (mySet.isEmpty) {
  print('Set is empty');
} else {
  print('Set is not empty');
}

Output

Set is empty

2 Check if Set is Empty Using length Property

In this example,

  1. We define a set named `mySet` containing elements of a specific type.
  2. We check if the length of elements in the set is equal to zero using the `length` property.
  3. If the length is zero, then the set is empty; otherwise, it contains elements.

Dart Program

// Define set
Set<String> mySet = {};

// Check if set is empty using length property
if (mySet.length == 0) {
  print('Set is empty');
} else {
  print('Set is not empty');
}

Output

Set is empty

3 Check if Set is Empty Using isEmpty Property

In this example,

  1. We define a non-empty set named `mySet` containing elements of a specific type.
  2. We check if the set is empty using the `isEmpty` property.
  3. If the `isEmpty` property returns `true`, then the set is empty; otherwise, it contains elements.

Dart Program

// Define non-empty set
Set<String> mySet = {'apple', 'banana', 'orange'};

// Check if set is empty using isEmpty property
if (mySet.isEmpty) {
  print('Set is empty');
} else {
  print('Set is not empty');
}

Output

Set is not empty

4 Check if Set is Empty Using length Property

In this example,

  1. We define a non-empty set named `mySet` containing elements of a specific type.
  2. We check if the length of elements in the set is equal to zero using the `length` property.
  3. If the length is zero, then the set is empty; otherwise, it contains elements.

Dart Program

// Define non-empty set
Set<String> mySet = {'apple', 'banana', 'orange'};

// Check if set is empty using length property
if (mySet.length == 0) {
  print('Set is empty');
} else {
  print('Set is not empty');
}

Output

Set is not empty

Summary

In this tutorial, we learned How to check if a Set is Empty in Dart language with well detailed examples.


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