This kind of libraries (and frameworks) provide an another abstraction layer behind our code making the execution process more complex. It’s invisible until you’ll need to debug your code because of errors.
Do you use constants in your code? Probably a lot. Even if you don’t define your own is highly probable that you use some constants defined by other libraries or a language itself. Constants are very powerful unless you use it in the wrong way.
In September, I wanted to try something new, so I started a simple project to check my abilities in UX and front-end development. The idea was simple — create customizable, reusable and highly accessible buttons. I have experience with front-end but I usually use CSS frameworks like Bootstrap or Foundation. But not now. I decided to design the whole page completely from scratch.