How to check if multiple values exist in shared preferences at once in flutter

Question

I know how to check for a single key if exist in shared preferences like this line for example:

bool check = preferences.containsKey('weight');

But what if I want to check for multiple keys at once, something like this:

bool check = preferences.containsKey('weight','height',userName...ect);

Is is possible to somehow check for multiple values at once?

Answer 1

There is no method in SharedPreferences to do that, but you can writen an extension method to make it look like there was:

extension SharedPreferencesExtensions on SharedPreferences {
  bool containsAllKeys(Iterable<String> keys) {
    return !keys.any((key) => !this.containsKey(key));
  }
}

Now you can call it like this:

bool check = preferences.containsAllKeys(['weight','height',userName...ect]);