What is the round() method in Dart?

void main() { 
  //converting to nearest int value
  int num = (-2.3).round();
  print('The temperature is ${num} in Texas');
  int num2 = (-2.5).round();
  print(num2);
  double n1 = 12.023; 
  double n2 = 12.89; 
  // compares if values are equal
  if (n1.round() == n2.round()){
    print('There are 12 apples in the basket');
  }
  else {
    print('Not equal');
  }
  // display result
  var value = n1.round(); 
  print( value ); 
  
  value = n2.round(); 
  print( value ); 
   
}