save static method
Implementation
static Future<bool> save(String key, value) async {
if (value is String) {
return await (await _instance)!.setString(key, value);
} else if (value is int) {
return await (await _instance)!.setInt(key, value);
} else if (value is double) {
return await (await _instance)!.setDouble(key, value);
} else if (value is bool) {
return (await _instance)!.setBool(key, value);
}
return await (await _instance)!.setStringList(key, value);
}