remove method
Implementation
remove(String key) async {
Directory directory = await getApplicationDocumentsDirectory();
File file = File('${directory.path}/$fileName.txt');
try {
var getJson = json.decode(await file.readAsString());
Map map = getJson;
map.remove(key);
var getFinal = json.encode(map);
await file.writeAsString(getFinal);
return true;
} catch (_) {
print('[$key] not found]');
return false;
}
}