[Question] Returning or NOT Returning a nullable from deserializeWith ?

[fvisticot]

My code is implementing a fromJson method calling the deserializeWith method returning an optional.

• Is it safe for me to return a Beacon and not a Beacon? ?

• In which case a null will be returned from the deserializeWith method

Code would be simple to maintain if method is returning a non nullable value and throw exception when required

static Beacon? fromJson(String jsonString) {
    return serializers.deserializeWith(
        Beacon.serializer, json.decode(jsonString));
  }

[davidmorgan]

That depends on the JSON.

Will it ever be the literal null? If so, deserialize can return null, and your method must return Beacon?.

If not, you should add a ! to the return statement and return Beacon. Then it will throw if the JSON says null.