Web Reference: The delete keyword deletes both the value and the property. After deleting, the property is removed. Accessing it will return undefined. 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. Jan 16, 2026 · JavaScript objects store data as key–value pairs, making them ideal for representing real-world entities. Object properties allow developers to easily organize, access, and modify related data.
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