Variables

Naming

1. case-sensitive
2. must start with _, $, or a letter
3. can only contain letters, digits, _, and $
4. no spaces allowed
5. cannot use reserved keywords

Best Practices

1. use camelCase
2. global, immutable variables all UPPERCASE

Syntax

You use let for mutable variable declaration and const for immutable. While it's possible to declare a variable without a keyword (name = "Dean") or by using var, those are legacy methods and you should not use them.