How to Filter Items of a Set based on a Condition in Dart - Step by Step Examples

How to Filter Items of a Set based on a Condition in Dart ?

Answer

To filter items of a set based on a condition in Dart, you can use the where method to apply a filtering predicate and create a new set from the filtered items.

✐ Examples

1 Filtering Numbers Greater Than 5

In this example,

We create a set named numberSet using the Set type, which contains integer values 1, 5, 10, 15, and 20.
We use the where method on numberSet to filter the numbers greater than 5 using a lambda function as the filtering condition.
We create a new set named filteredSet using the Set constructor with the filtered items from the where method.
Finally, we iterate through filteredSet and print each filtered item to the console.

Dart Program

void main() {
  var numberSet = {1, 5, 10, 15, 20};

  var filteredSet = numberSet.where((num) => num > 5).toSet();

  filteredSet.forEach((num) => print(num));
}

Output

10
15
20

2 Filtering Strings Containing 'a'

In this example,

We create a set named stringSet using the Set type, which contains string values 'apple', 'banana', 'cherry', 'date', and 'grape'.
We use the where method on stringSet to filter the strings containing the letter 'a' using a lambda function as the filtering condition.
We create a new set named filteredStringSet using the Set constructor with the filtered items from the where method.
Finally, we iterate through filteredStringSet and print each filtered string to the console.

Dart Program

void main() {
  var stringSet = {'apple', 'banana', 'cherry', 'date', 'grape'};

  var filteredStringSet = stringSet.where((str) => str.contains('a')).toSet();

  filteredStringSet.forEach((str) => print(str));
}

Output

apple
banana
grape

Summary

In this tutorial, we learned How to Filter Items of a Set based on a Condition in Dart language with well detailed examples.

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