Nowadays JavaScript has three different keywords to declare a variable — var, let and, const. Each has its own properties and particularities. Let’s start by making a simple comparison table ...

To make sure your programming team is clear about the scope of a project and what needs to be done, hold weekly meetings. By having weekly meetings, you can make sure everyone is on track.

i.e. intuitively it looks like the variable will only be available within the block but it is accessible outside the block .. in javascript's case, because var doesn't make a block level ...