Dart Runes whereType()
Syntax & Examples

Runes.whereType() method

The `whereType` method in Dart returns a new lazy Iterable with all elements that have type T.

Syntax of Runes.whereType()

The syntax of Runes.whereType() method is:

 Iterable<T> whereType<T>()

This whereType() method of Runes returns a new lazy Iterable with all elements that have type T.

Return Type

Runes.whereType() returns value of type Iterable<T>.


✐ Examples

1 Filtering integers from a mixed list

In this example,

  1. We create a list mixedList containing elements of various types.
  2. We use the whereType() method with type int to filter integers.
  3. We convert the resulting Iterable to a list and print it.

Dart Program

void main() {
  List<dynamic> mixedList = [1, 'apple', true, 2.5, 'banana'];
  Iterable<int> integers = mixedList.whereType<int>();
  print(integers.toList());
}

Output

[1]

2 Filtering strings from a mixed list

In this example,

  1. We create a list mixedList containing elements of various types.
  2. We use the whereType() method with type String to filter strings.
  3. We convert the resulting Iterable to a list and print it.

Dart Program

void main() {
  List<dynamic> mixedList = [1, 'apple', true, 2.5, 'banana'];
  Iterable<String> strings = mixedList.whereType<String>();
  print(strings.toList());
}

Output

[apple, banana]

3 Filtering integers from a mixed set

In this example,

  1. We create a set mixedSet containing elements of various types.
  2. We use the whereType() method with type int to filter integers.
  3. We convert the resulting Iterable to a list and print it.

Dart Program

void main() {
  Set<dynamic> mixedSet = {1, 'apple', true};
  Iterable<int> integers = mixedSet.whereType<int>();
  print(integers.toList());
}

Output

[1]

Summary

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