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Dart| Flutter How to check element exists in Array


This tutorial shows how to check element exists in array or list Dart or Flutter List

How to check sublist exists in a list of  Dart and Flutter

In dart, Array and List stores the same type of collections, Arrays are fixed, List are dynamic in nature.

Let’s see how to check an element exists in array or list

How do Check value exist in a Array or List of dart/flutter?

dart list provides multiple ways to check the sub list contains in the list of elements.

First Convert list into set using Set.of() method Check sub list exists in Set using Set.containsAll() method

Here is an example code

void main() {
  List<int> array = [1, 4, 5, 2, 8];

  print(array.contains(2)); // true
  print(array.contains(21)); // false
}
void main() {
  List<String> array = ["one", "two", "three"];

  print(array.contains("one"));// true
  print(array.contains("four")); // false
}
  • use indexOf
void main() {
  List<String> array = ["one", "two", "three"];

  print(array.indexOf("one") >= 0); // true, 
  print(array.indexOf("four") >= 0); // false,
}

Conclusion

To summarize, Learn how to check the sublist contains all elements in a list dart and flutter.

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