A lot of shiny new features came out with ES2015 (ES6). And now, since it's
2020, it's assumed that a lot of JavaScript developers have become familiar with
and have started using these features.

While this assumption might be partially true, it's still possible that some of
these features remain a mystery to some devs.

One of the features that came with ES6 is the addition of let and const, which
can be used for variable declaration. The question is, what makes them different
from good ol' v