Are single quotes the preferred way of making strings nowadays then? It seems to be pretty common among new JS frameworks/libraries source code that I see nowadays.

    var asdf = "asdf";

vs

    var asdf = 'asdf';

I really haven't been doing any JS programming for quite a while now.

I'm not sure why/when the shift took place, but I do like it because it looks a lot cleaner than double quotes.

At work I use airbnb's linting configuration as shown here[1], which specifies the usage of single quotes for strings (no explanation for the preference though).

[1] https://github.com/airbnb/javascript