getArray method
Implementation
Future<WalfList> getArray(String key) async {
var data = _getData(key, databaseName);
/// Get all datas from named database.
if (data.runtimeType == List) {
return WalfList(key, data);
/// if true, return json data
} else {
WalfLogger.warning("$key: List data not found");
/// if false, warn developper by WalfLogger
return WalfList(key, []);
/// if false, return empty
}
}