JavaScript | typeof operator

In JavaScript, the typeof operator returns the data type of its operand in the form of a string. Operand can be any object, function or variable.

Syntax:

typeof operand
      OR
typeof (operand)

Examples:

Input: typeof "geeksforgeeks"
Output: string

Input: typeof NaN
Output: number
NaN is also considered as a number.

<!DOCTYPE html> 
<html> 
<body> 
<p id="GFG"></p> 
<script> 
document.getElementById("GFG").innerHTML =  
    typeof "Siddharth" + "<br>" + 
    typeof 3.14 + "<br>" + 
    typeof true + "<br>" + 
    typeof NaN + "<br>" + 
    typeof [5, 10, 15, 20] + "<br>" + 
    typeof {name:'Siddharth', age:20} + "<br>" + 
    typeof new Date() + "<br>" + 
    typeof function () {} + "<br>" + 
    typeof workout + "<br>" + 
    typeof null; 
</script> 
</body> 
</html> 

Output:

string
number
boolean
number
object
object
object
function
undefined
object

My Personal Notes

Recommended Posts:

Siddharth_Pandey

Lets get started

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.