Use a for-in loop to print out the three ways to say hello. In the loop, you should check to see if the property value is a string so you don't accidentally print a number. it's possible to pose a …

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

ECMAScript 5 (2009) defined a new method for this: Array.isArray(): The instanceof operator returns true if an object is an instance of a specified object type: The typeof of an undefined …

Nov 9, 2020 · The JavaScript typeof Operator. The typeof operator takes only one operand (a unary operator). It evaluates the type of the operand and returns the result as a string. Here is …

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 …

Mar 3, 2024 · # Check if a Variable is a String in JavaScript. Use the typeof operator to check if a variable is a string, e.g. if (typeof variable === 'string'). If the typeof operator returns "string", …

Jul 28, 2023 · Learn how to use the typeof operator within an if statement in JavaScript to check the type of a value before performing an operation on it. This article provides clear …

Edit: The current way to do it is typeof value === 'string'. For example: const str = 'hello'; if (typeof str === 'string') { ... } Below has been deprecated since node v4. If you work on the node.js …

Dec 2, 2024 · The typeof operator in JavaScript returns a string that indicates the type of a given variable or expression. It is particularly useful for understanding the kind of data stored in a …

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.