Web Reference: Properties are key:value Pairs A JavaScript object is a collection of properties Properties can be changed, added, and deleted. Properties are like variables, but for objects - they can be used to store simple types like numbers and strings, or even complex types like other objects. They can even hold a reference to a function, basically allowing you to add methods to an object, as we'll see in the next article. Feb 21, 2026 · In the same way, JavaScript objects can have properties, which define their characteristics. In addition to objects that are predefined in the browser, you can define your own objects. This chapter describes how to use objects, properties, and methods, and how to create your own objects.
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