Count in Dart

To count the number of elements in an array matching a condition in Dart, you can use the where() method to filter the list and then use the length property to get the number of matching elements.

Here's an example:

void main() {
  List numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
  
  int countEven = numbers.where((number) => number % 2 == 0).length;
  print('Total even numbers: $countEven'); // Output: Total even numbers: 5
  
  int countOdd = numbers.where((number) => number % 2 != 0).length;
  print('Total odd numbers: $countOdd'); // Output: Total odd numbers: 5
}

In the above example, we have a list of 10 numbers. We use the where() method to filter the list based on whether the number is even or odd. Then we use the length property to get the number of elements that match the condition. Finally, we print the counts to the console.

You can modify the condition inside the where() method to count elements that satisfy any other condition.