How can I determine whether a variable is a string or something else in JavaScript? This is what works for me: [ 'null', null ], [ 'undefined', undefined ], [ 'object', { a: 1, b: 2 } ], [ 'array', [ 1, 2, 3 ] …

Aug 20, 2024 · Checking if a variable is a string in JavaScript is a common task to ensure that the data type of a variable is what you expect. This is particularly important when handling user …

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 …

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; …

Apr 3, 2025 · The typeof operator returns a string indicating the type of the operand's value.

Sep 25, 2019 · Javascript provides 2 operators to check the type of a given value : typeof: This checks whether the value is one of the primitive data types. It will return a string specifying the …

Sep 20, 2024 · In JavaScript, it's important to know the data type of a variable to avoid unexpected behavior in your code. This article will guide you through various methods to …

May 20, 2022 · Forget about typeof and instanceof, the best way to check data types is to use Object.prototype.toString the typeof operator # The typeof operator is probably the first that …

Aug 20, 2009 · for checking if the variable is a string (even if you use var str = new String("foo"), str instanceof String would return true). As for checking if it's a number I would go for the …

Learn how JavaScript's typeof operator can help identify the data type of a value and how to use it for basic type checking and validation in your code.