Dart Set removeWhere()
Syntax & Examples

Set.removeWhere() method

The `removeWhere` method in Dart removes all elements from the set that satisfy a given test.

Syntax of Set.removeWhere()

The syntax of Set.removeWhere() method is:

 void removeWhere(bool test(E element))

This removeWhere() method of Set removes all elements of this set that satisfy test.

Parameters

ParameterOptional/RequiredDescription
testrequiredA function that takes an element of the set as input and returns a boolean value. If the return value is true, the element is removed from the set.

Return Type

Set.removeWhere() returns value of type void.


✐ Examples

1 Remove even numbers from set

In this example,

  1. We create a Set set containing integers.
  2. We use the removeWhere() method with a test function that removes elements divisible by 2 (i.e., even numbers).
  3. We print the resulting Set to standard output.

Dart Program

void main() {
  Set<int> set = {1, 2, 3, 4};
  set.removeWhere((element) => element % 2 == 0);
  print('Set after removing even numbers: $set');
}

Output

Set after removing even numbers: {1, 3}

2 Remove elements containing letter 'a' from set

In this example,

  1. We create a Set set containing strings.
  2. We use the removeWhere() method with a test function that removes elements containing the letter 'a'.
  3. We print the resulting Set to standard output.

Dart Program

void main() {
  Set<String> set = {'apple', 'banana', 'orange', 'berry'};
  set.removeWhere((element) => element.contains('a'));
  print('Set after removing elements containing letter a: $set');
}

Output

Set after removing elements containing letter a: {berry}

Summary

In this Dart tutorial, we learned about removeWhere() method of Set: the syntax and few working examples with output and detailed explanation for each example.