How do I replace an arrayname with a variable string in jquery or javascript

Question

I have the following (simplified):

const eeveesheroes = [ "Pinsir", "001", "2"];
x = eeveesheroes[0];

But I want to be able to do this:

const eeveesheroes = [ "Pinsir", "001", "2"];
var selectedserie = "eeveesheroes";
x = selectedserie[0];

Maybe the question has been asked before here but I just dont know how to phrase the question, so the search results are getting me nowhere. How do I replace an arrayname with a variable string which contains the name of the array?