typeof - JavaScript | MDN
Jan 8, 2026 · The typeof operator returns a string indicating the type of the operand's value.
JavaScript typeof - W3Schools
Primitive Data Types In JavaScript, a primitive value is a single value with no properties or methods. JavaScript has 7 primitive data types: string number boolean bigint symbol null undefined The typeof …
JavaScript Type Checking – How to Check Type in JS with typeof ()
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 …
How to check the type of a variable or object in JavaScript
Jul 23, 2025 · The typeof operator in JavaScript allows you to determine the type of value or type of value that a variable contains . There is just one operand for the typeof operator (a unary operator), …
How to check the type of a variable in JavaScript · CoreUI
Nov 6, 2025 · Learn how to check variable types in JavaScript using typeof operator and other methods for robust type checking.
How to Check Variable Types in JavaScript (With Examples)
Feb 5, 2025 · Learn how to check variable types in JavaScript with examples. Discover methods like typeof, instanceof, Object.prototype.toString.call, and more. A must-read for JavaScript developers.
JavaScript Typeof - Data Type Checking - ZetCode
Apr 16, 2025 · Learn how to check data types in JavaScript using the typeof keyword, with examples and best practices.
JavaScript typeof Operator - W3Schools
JavaScript typeof The typeof operator returns the type of a variable, object, function or expression. Please observe: The data type of NaN is number The data type of an array is object The data type of …