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