Two words, Hoisting and Scope Almost all tutorials when you’re starting out will say that you shouldn’t use the var keyword, as it results in ambiguity and that it acts differently. But why is that? You might think it’s just an outdated keyword that had bugs on it, but actually…

It’s one of those words that seems difficult but really easy to wrap your head around. What hoisting means is to reserve space on the memory heap for your variables and functions. variables defined with the var keyword gets “partially” hoisted and function declarations gets “fully” hoisted. Take the below…