Javascript basic tutorial typeof operator

typeof operator

typeof is used to detect the data type of variables. The following characters will be returned for values and variables

Undefined

In JavaScript, undefined is a variable that has no set value.

typeof A variable with no value will return undefined.

Let’s write an example below:

The above code will output undiffed

Boolean type

The following example:

string type

number type

Object

Note: An empty object means that the object has been created, but there is no content in it

NULL empty

function function

Note: box is a function function. The return value is function box(){}. The returned character channeling type is function