The primitive data types

·            Number

·            String

·            Boolean

Terms to know...

·            integer

·            floating-point value

·            exponent

·            empty string

·            escape sequence

·            Boolean value

 

Rules for creating identifiers in JavaScript

·            Identifiers can only contain letters, numbers, the underscore, and the $.

·            Identifiers can’t start with a number.

·            Identifiers are case-sensitive.

·            Identifiers can be any length.

·            Identifiers can’t be the same as reserved words.