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The difference between Undefined and Null

The values of Undefined and null are equal, but the types are not equal:

Typeof undefined / / undefined

Typeof null / / object

Null = undefined / / false

Null = = undefined / / true

raw data

The raw data value is a single simple data value with no additional properties and methods.

The typeof operator can return one of the following primitive types:

String

Number

Boolean

Undefined

Example

Typeof "Bill" / / 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 types:

Function

Object

The typeof operator returns an object, array, or null to object.

The typeof operator does not return the function to object.

Example

Typeof {name:'Bill', age:62} / / returns "object"

Typeof [1 array 2 3 4] / / returns "object" (not "array", see the note below)

Typeof null / / returns "object"

Typeof function myFunc () {} / / returns "function"

The typeof operator returns the array as "object" because in JavaScript an array is an object.

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