getAll method
Gets the stash values for the specified set of keys
keys
: the set of keys to get
Returns a map of key / value pairs
Implementation
Future<Map<String, T?>> getAll(Set<String> keys) {
return Future.wait(keys.map((key) {
return get(key).then((value) => MapEntry(key, value));
})).then((value) => Map.fromEntries(value));
}