How to check if Widget has mounted in flutter

Question

So in my app, I want to make an Ajax request as soon as the widget is mounted, not in initState(). Similar to ComponentWillMount() in react

Answer 1

if the Widget has not mounted then return. Do it before the setState method

if (!mounted) return;
setState(() {});

or

if (mounted) {
   //Do something
};
setState(() {});