Dart Set every()
Syntax & Examples

Set.every() method

The `every` method in Dart checks whether every element of this iterable satisfies the provided test function.

Syntax of Set.every()

The syntax of Set.every() method is:

 bool every(bool test(E element))

This every() method of Set checks whether every element of this iterable satisfies test.

Parameters

ParameterOptional/RequiredDescription
testrequiredA function that takes an element of the iterable and returns a boolean value.

Return Type

Set.every() returns value of type bool.


✐ Examples

1 Checking if all numbers are even

In this example,

  1. We create a List numbers with values [2, 4, 6, 8].
  2. We use the every() method with a test function that checks if all elements are even.
  3. We print the result, which indicates if all numbers in the list are even.

Dart Program

void main() {
  List<int> numbers = [2, 4, 6, 8];
  bool allEven = numbers.every((element) => element.isEven);
  print(allEven);
}

Output

true

2 Checking for long words

In this example,

  1. We create a List words with values ['apple', 'banana', 'cherry'].
  2. We use the every() method with a test function that checks if all words have a length greater than 3.
  3. We print the result, which indicates if all words in the list are long.

Dart Program

void main() {
  List<String> words = ['apple', 'banana', 'cherry'];
  bool allLong = words.every((element) => element.length > 3);
  print(allLong);
}

Output

false

Summary

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