The Difference of “var” vs “let” vs “const” in Javascript

Let and const are two new features of ES6, which came out in 2015. Before that, var was the only way to declare a variable. var var can do so many things since the variable declared under var can be scoped globally and locally. Hoisting is a JS way to call a variable/function on top of the scope. With the convenience of scoping and updating a var variable, it is easy to spot when writing small programs.