Web Reference: Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more. Add New Properties to a JavaScript Object You can add new properties to existing JavaScript objects the same way you would modify them. Here's how we would add a bark property to ourDog: ourDog.bark = "bow-wow"; or ourDog["bark"] = "bow-wow"; Now when we evaluate ourDog.bark, we'll get his bark, bow-wow. Example: Jul 29, 2025 · One of the most common tasks when working with objects in JavaScript is adding new properties. JavaScript provides two primary ways to add properties to an object: 1. Using Dot Notation to Add Properties. Dot notation is the simplest and most commonly used method for adding properties to an object.
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