In JavaScript there are 5 different data types that can contain values:

• string
• number
• boolean
• object
• function

There are 6 types of objects:

• Object
• Date
• Array
• String
• Number
• Boolean

And 2 data types that cannot contain values:

• null
• undefined

JavaScript typeof

==============

typeof “John” // Returns “string”

typeof 3.14 // Returns “number”

typeof NaN // Returns “number”

typeof false // Returns “boolean”