How to get the LocalStorage value out of promise scope

@rapropos but in case I have to do lengthy operation… then this should not be the good practice… right??

And suppose if I am retrieving two or more values from localstorage and using those two or more values for data manipulation inside single function i.e. getData()… then how it could be possible to work with them…

If i have start_time and stop_time inside localstorage… i want to use it in the getData() function then how I can retrieve both those localstorage value…to do operation like this…

var start_time = this.local.get('start_time').then(.......);
var stop_time = this.local.get('stop_time').then(.....)
var elapsed_time = stop_time - start_time;

I think this may not be applicable with above suggested approach…
And if possible can you plz help me out of this :pensive: