Apr 3, 2025 · The typeof operator returns a string indicating the type of the operand's value. An expression representing the object or primitive whose type is to be returned. The following table summarizes the possible return values of typeof. For more information about types and primitives, see also the JavaScript data structure page.

The typeof operator returns object for all types of objects: objects; arrays; sets; maps; You cannot use typeof to determine if a JavaScript object is an array or a date.

Nov 9, 2020 · JavaScript has a special operator called typeof which lets you get the type of any value. In this article, we will learn how typeof is used, along with a few gotchas to watch out for. Let's take a quick look at JavaScript data types before we dig into the typeof operator. In JavaScript, there are seven primitive types.

Dec 13, 2024 · The typeof operator in JavaScript is used to determine the data type of a value or variable. It returns a string indicating the type, such as “string”, “number”, “boolean”, “object”, etc. Always outputs the data type as a string. Can be used anywhere without imports or dependencies. Determines the type of literals, variables, and expressions.

In this tutorial, you'll learn how to use the JavaScript typeof operator that returns a string representing the type of a value.

Dec 23, 2019 · typeof is a JavaScript keyword that will return the type of a variable when you call it. You can use this to validate function parameters or check if variables are defined. There are other uses as well.

The typeof operator returns the type of variables and values. For example, console.log(typeof a); // number console.log(typeof '9'); // string console.log(typeof false); // boolean. The syntax of typeof operator is: Here, operand is a variable name or a value. The possible types that are available in JavaScript that typeof operator returns are:

Apr 12, 2025 · Typeof in JavaScript is an operator used for type checking and returns the data type of the operand passed to it. The operand can be any variable, function, or object whose type you want to find out using the typeof operator.

Apr 11, 2025 · Typeof is an operator in JavaScript used to to check the type variable in your code. It can return one of JavaScript’s eight data types, and it’s especially useful for returning most of the primitive types in JavaScript, including undefined, string and number.

Dec 9, 2022 · To validate variables by checking their types in JavaScript, you can use the typeof operator. Type checking in JavaScript is not straightforward for non-primitive data types and specific values. This is why type-checking can become annoying, especially for …