How to Filter Elements of a List based on a Condition in Dart - Step by Step Examples

How to Filter Elements of a List based on a Condition in Dart ?

Answer

To filter elements of a list based on a condition in Dart, you can use the where method along with anonymous functions (closures).

✐ Examples

1 Filter Integers Greater Than a Threshold

In this example,

We create a list named numbers with integer values.
We use the where method along with an anonymous function to filter elements greater than a threshold value.
Finally, we print the filtered list to standard output.

Dart Program

void main() {
  List<int> numbers = [1, 2, 3, 4, 5];
  int threshold = 3;
  var filteredNumbers = numbers.where((num) => num > threshold);
  print('Filtered list: \$filteredNumbers');
}

Output

Filtered list: (4, 5)

2 Filter Strings Containing a Substring

In this example,

We create a list named words with string values.
We use the where method along with an anonymous function to filter elements containing a specific substring.
Finally, we print the filtered list to standard output.

Dart Program

void main() {
  List<String> words = ['apple', 'banana', 'cherry', 'date', 'elderberry'];
  String substring = 'erry';
  var filteredWords = words.where((word) => word.contains(substring));
  print('Filtered list: \$filteredWords');
}

Output

Filtered list: (cherry, elderberry)

Summary

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

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How to Filter Elements of a List based on a Condition in Dart - Step by Step Examples

How to Filter Elements of a List based on a Condition in Dart ?

Answer

✐ Examples

1 Filter Integers Greater Than a Threshold

Dart Program

Output

2 Filter Strings Containing a Substring

Dart Program

Output

Summary

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