toInteger static method
Tries to parse value into integer.
null, int, double, bool, String
If none found, then 'null' is returned.
Implementation
static int? toInteger(dynamic value) {
  if (value is int) {
    return value;
  }
  if (value == null) {
    return null;
  }
  if (value is double) {
    return value.toInt();
  }
  if (value is bool) {
    return value ? 1 : 0;
  }
  if (value is String) {
    return int.tryParse(value) ?? double.tryParse(value)?.toInt();
  }
  return null;
}