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The typeof is an operator present in most programming languages and is used to verify the datatype of an operand (opernad: the variable which is operated on).

In this generate-up, we will discover all about the typeof operator, what it is and how to use it but first, we need to fully grasp what info types are.

What are data styles:

Info styles are a classification of information that defines how data can be saved and manipulated. Every single programming language has developed-in details varieties which may be different from other programming languages.

Here’s a list of the six most essential facts forms in JavaScript:

  • Selection: As the title implies, it consists of figures
  • Boolean: Booleans can have only two diverse values legitimate or bogus.
  • String: Strings are a collection of alphanumeric figures.
  • Undefined: Empty or undeclared variable.
  • Object: Bundle/Assortment of Information

The typeof is not a purpose, but somewhat it is an operator. In programming languages, features and operators are unique they may well behave likewise but are synthetically and semantically diverse.

How to use typeof operator:

A variable is handed to the typeof operator as a parameter and returns the variable’s datatype.


Each of the syntaxes outlined higher than are right. The operand can be written with or without having parentheses.

Note: We will use the browser console to show illustrations carried out in this article. To open up the browser console:

  • Use the F12 key in Chrome and other chromium-based browsers.
  • Use CTRL + Shift + K keyboard shortcut keys for Mozilla.
  • Use Option + ⌘ + C keyboard shortcut keys in Safari (if the developer menu does not surface, open Choices by urgent ⌘ + , and in the Highly developed tab, check “Show Build menu in menu bar”).


Now we will glance at a couple illustrations of typeof operators. The typeof operator is existing in a lot of programming languages, but we will use the JavaScript syntax for these examples.

In the code provided under, we have declared a variable named age and assigned it a benefit of 10. Then we applied the typeof operator to determine the datatype of age. The typeof operator was place inside of console.log() to output the return benefit of the typeof operator on the console.

var age = 10

If we assign a new value to age, i.e., 10 as an alternative of 10, then the output changes to:

var age = ‘ten’

Now, if we do not assign any price to age and use the typeof operator on it then the operator will return the following benefit:

var age


We can use the identical technique to determine other knowledge styles as well like boolean, object and symbol, and many others.:

var x = accurate


As you have now viewed in the previously mentioned examples, the typeof operator can be combined with other functions and procedures these kinds of as conolse.log. It can also be put together with conditionals, loops, and many others.

In the case in point provided underneath, the typeof operator is applied with conditional statements:

var age = 5
if (typeof(age) == ‘number’)

console.log(‘The presented quantity is in the type of digits.’)  


console.log(‘The supplied range is not in the form of digits.’)

Now, if we adjust the age from 5 to five, then the output adjustments to:


The typeof operator returns the datatype of the operand (the variable which is passed as the parameter to the operator). It is incredibly beneficial in programming languages these as JavaScript as it has dynamic details forms. Dynamic data sort signifies that the very same variable can keep various details sorts in just a single plan.

In this create-up, we have figured out what knowledge styles are and an operator in programming languages. Additionally, we have also figured out about the typeof operator and how to use it using JavaScript syntax.

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