In today’s tutorial, we’re going to learn how to declare, interact, and scope variables in JavaScript. We’ll introduce new concepts and important JavaScript keywords like var, let and const.

Then there are variables you create while writing your programs, using the let and const keywords. These are defined by you, the user.

[In case you don't know, in ECMAScript/JavaScript, variables declared with var have global or function-level scope, and variables declared with let have block-level scope.] Lately all the code ...