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.

‘Higher-order functions’ is a fancy term for functions that take other functions as arguments or that return functions. Very powerful!

Ordinarily with JavaScript, you can change pretty much any variable you want. Any variable you declare can be reassigned to any other value, unless you use the const keyword.