I don't agree that library developers should make user lives easier. I want from library to provide only `addClass('name1')`. I can write array iteration, it's not hard. I need library to have a stable interface, as simple as possible. And I need library to have quality implementation. I don't use libraries for fancy APIs. I use libraries for tested implementation code. If I need fancy API, I'll write it for my use-case which will be better for my application anyway.