toNullableLong static method
Converts value into long or returns null when conversion is not possible.
value
the value to convert. Returns long value or null when conversion is not supported.
Implementation
static int? toNullableLong(value) {
if (value == null) return null;
if (value is int) return value;
if (value is double) return value.ceil();
if (value is DateTime) return value.millisecondsSinceEpoch;
if (value is Duration) return value.inMilliseconds;
if (value is bool) return value ? 1 : 0;
var result = double.tryParse(value.toString());
return result == null ? null : result.truncate();
}