SliderWidget

I'm building a page with multiple styled sliders, so I made a separate SliderWidget class. The slider itself behaves normally, but when I try to print the value of the slider to console, it returns null as flutter: null.

I've tried putting specific int values into my currentValue variable (in the SliderWidget class) to test with no luck, so I'm pretty sure that the problem is the getter itself, but I can't figure out what is wrong. I'm pretty new to flutter, so it's very possible I did something stupid.

Here is the slider object:

I make an api call to openWeatherapi but the issue is the data is "undefined" until it has resolved. So when i make the api call in ComponentDidMount and set the data to state, state is undefined for a bit until the data comes in. The issue is that in the meantime if i try to do anything with the data i get cannot "Dosomething" of propriety of undefined and the whole thing crashes. How do i get around this?

I have a weatherwidget and i want to pass the weather data from the api call. The city name includes the continent, so if i want to do .split() on it, i get an error because the value is undefined at first.

Here's the dashboard code

In my notebook i have 7 FloatSlider widgets. I want to have the product of these 7 widgets displayed at all times in a way that, as the user moves the sliders, the value displayed is updated. Currently i am trying to display the product of the SliderWidgets in a Widgets.Text (n), but i am not sure if it is the best solution.