Include in Dart

In Dart, you can check whether an array contains a particular element by using the contains() method. The contains() method returns a boolean value indicating whether the given element exists in the array or not.

Here is an example that uses the contains() method to search for an element in a simple array of integers:

void main() {
  List numbers = [1, 2, 3, 4, 5];
  
  print(numbers.contains(3)); // true
  print(numbers.contains(6)); // false
}

In this example, we declare an array numbers that contains the integers from 1 to 5. We then use the contains() method to check whether the array contains the integer 3 and 6, respectively. The contains() method returns true for the integer 3, and false for the integer 6.

You can also use the contains() method on arrays that contain other data types, like strings or objects. Here's an example that shows how to search for a string in an array of strings:

void main() {
  List animals = ['cat', 'dog', 'rat', 'bird'];
  
  print(animals.contains('dog')); // true
  print(animals.contains('snake')); // false
}

In this example, we declare an array animals that contains four strings representing the names of animals. We then use the contains() method to check whether the array contains the string "dog" and "snake", respectively. The contains() method returns true for the string "dog", and false for the string "snake".

So, that's how you check if an array includes an element in Dart.