So do I use "var" or "let" to declare variables now?

I generally start with const by default now, but decision between var and let is really about scope, I often use lets inside a loop or a function where the scope is only to that part of the code.

If I need more global scope and a changing variable I will use var.

If you need function scope or hoisting, you'd need "var". But if you rethink your code structure, you can probably change it so neither of these is required. And I personally like using "var" for global variables to visually distinguish them.

Otherwise, using "const" for things that do not change, and "let" for things that do are good practice choices.

You should use 'const'. Unless you need to change the value of a variable later on, then use 'let'.

'Var' is still being used in TreeHouse videos because the videos are old. But they are still relevant.

As I understood, var should be always be avoided from now on...

• const should be your first option, and if you don't want your variable to be overwritten later on.
• let is for when te value of your variable is going to be overwritten altogether.

You should always use let when you can i.e use it more often. while var has issues with scope and its generally not in use anymore. You should also use const to declare variables cause it helps to prevent errors.

Thanks, Steven