How to get union of two or more jQuery NodeList elements stored in variables?

Question

For Example :
let input = $(".inputs"), source = $(".sources");
// Now I want to merge both variables input and source into one. How do I achieve that?
// Something like this -
let add = input + source;
// And I don't want to do this - add = $(".inputs, .sources")

Answer 1

let add = {input, source};

What is the reason for this?