To understand further, look at the example below. This means that it is available and can be accessed only within that function. Var is function scoped when it is declared within a function.
This means that any variable that is declared with var outside a function block is available for use in the whole window.
The scope is global when a var variable is declared outside a function. var declarations are globally scoped or function/locally scoped. Scope essentially means where these variables are available for use. First, let's get to understand var more before we discuss those issues. That is why it was necessary for new ways to declare variables to emerge. There are issues associated with variables declared with var, though. Here's an Interactive Scrim of Var, Let, and Const Varīefore the advent of ES6, var declarations ruled. As you read, take note of the differences between them that I'll point out. In this article, we'll discuss var, let and const with respect to their scope, use, and hoisting. The question is, what makes them different from good ol' var which we've been using? If you are still not clear about this, then this article is for you. One of the features that came with ES6 is the addition of let and const, which can be used for variable declaration.
While this assumption might be partially true, it's still possible that some of these features remain a mystery to some devs. 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. A lot of shiny new features came out with ES2015 (ES6).
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