Dart Set map()
Syntax & Examples

Set.map() method

The `map` method in Dart returns a new lazy Iterable with elements that are created by calling the provided function on each element of the set in iteration order.

Syntax of Set.map()

The syntax of Set.map() method is:

 Iterable<T> map<T>(T f(E e))

This map() method of Set returns a new lazy Iterable with elements that are created by calling f on each element of this Iterable in iteration order.

Parameters

ParameterOptional/RequiredDescription
frequiredThe function to apply to each element of the set.

Return Type

Set.map() returns value of type Iterable<T>.


✐ Examples

1 Map integers to strings

In this example,

  1. We create a Set set containing integers.
  2. We use the map() method with a function that converts each integer to a string with a prefix 'Number'.
  3. We print the mapped Iterable to standard output.

Dart Program

void main() {
  Set<int> set = {1, 2, 3};
  Iterable<String> mappedSet = set.map((e) => 'Number $e');
  print(mappedSet);
}

Output

(Number 1, Number 2, Number 3)

2 Map strings to their lengths

In this example,

  1. We create a Set set containing strings.
  2. We use the map() method with a function that computes the length of each string.
  3. We print the mapped Iterable to standard output.

Dart Program

void main() {
  Set<String> set = {'apple', 'banana', 'orange'};
  Iterable<int> mappedSet = set.map((e) => e.length);
  print(mappedSet);
}

Output

(5, 6, 6)

Summary

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