The for…in loop iterates over enumerable properties of objects, providing access to property names for object inspection and manipulation. With over 25 years of experience in software development and as the creator of CoreUI, I’ve used for…in loops extensively for configuration processing, object validation, and dynamic property access. From my expertise, the most reliable approach is using for…in specifically for object property iteration while being aware of prototype chain inheritance. This loop type is essential for working with dynamic objects and configuration data where property names aren’t known in advance.