toOrdinal method
Converts this double to an ordinal string (1st, 2nd, 3rd, etc.).
Example:
double value = 1.0;
String ordinal = value.toOrdinal(); // '1st'
Implementation
String toOrdinal() {
final intValue = round();
final suffix = _getOrdinalSuffix(intValue);
return '$intValue$suffix';
}