Primitive Data

A primitive data value is a single simple data value with no additional properties and methods.

The typeof operator can return one of these primitive types:

• string
• number
• boolean
• undefined

Example

typeof "John"              // Returns "string"

typeof 3.14                // Returns "number"

typeof true                // Returns "boolean"

typeof false               // Returns "boolean"

typeof x                   // Returns "undefined" (if x has no value)

Complex Data

The typeof operator can return one of two complex types:

• function
• object

The typeof operator returns "object" for objects, arrays, and null.

The typeof operator does not return "object" for functions.

Example

typeof {name:'John', age:34} // Returns "object"

typeof [1,2,3,4]             // Returns "object" (not "array", see note below)

typeof null                  // Returns "object"

typeof function myFunc(){}   // Returns "function"