Understanding JavaScript Objects: Properties, Descriptors, and Configuration

JavaScript objects are collections of properties that can be created dynamically using simple syntax or built-in methods. Each property carries hidden configuration attributes, including enumerable, writable, configurable, value, get, and set descriptors. The global Object provides built-in methods such as Object.defineProperty and Object.defineProperties, which allow developers to precisely control how individual properties behave. Notably, data descriptors (value and writable) and accessor descriptors (get and set) are mutually exclusive and cannot be used together on the same property. These configuration options enable developers to hide properties from iterators, restrict modifications, and define custom getter and setter logic.