getDouble method
Implementation
Future<WalfDouble>? getDouble(String key) async {
var data = await _getData(key, databaseName);
/// Get all datas from named database.
if (data.runtimeType == double) {
///Check data type
return WalfDouble(key, data);
/// if true, return json data
} else {
WalfLogger.warning("$key: Double data not found");
/// if false, warn developper by WalfLogger
return WalfDouble(key, 0);
/// if false, return 0
}
}