isGroupingUsed method
Returns true if this formatter groups together digits in the integral portion of a number, based on the options set up in the constructor
Implementation
bool isGroupingUsed() {
String result = '';
final String formatOptions = toJsonString();
final String jscode1 = 'new NumFmt($formatOptions).isGroupingUsed()';
result = ILibJS.instance.evaluate(jscode1).stringResult;
return result.toLowerCase() == 'true';
}