getDouble method

@override Future<double?> getDouble(String key)

Gets a double value

@param key The key to retrieve the double from @return A Future that resolves to the double value or null

Implementation

@override
Future<double?> getDouble(String key) async {
  if (_cache == null) {
    await _updateCache();
  }
  if (_cache == null) return null;
  return _cache![key] as double?;
}