What does Object.keys return when called on an object?

What does Object.keys return when called on an object?

• A. Values of the object properties.
• B. The total number of properties in the object.
• C. An array of the object's keys.
• D. The methods defined in the object.

Answer: (C)

When Object.keys is called on an object, it returns an array containing the keys (or property names) of that object. This functionality allows you to quickly access and manipulate the keys of an object, providing a useful way to enumerate over properties when you need to understand the structure of the object. For example, if you have an object defined as: ```javascript const example = { a: 1, b: 2, c: 3 }; ``` Calling Object.keys(example) would yield: ```javascript ["a", "b", "c"] ``` This result can be particularly beneficial in various scenarios, such as iterating over an object’s properties or performing operations based on those keys. The other options do not accurately represent the output of Object.keys. The method does not return values of the properties, the total count of properties, or only the methods defined in the object. It strictly focuses on extracting the keys, making the selected answer the best representation of what Object.keys does.

When Object.keys is called on an object, it returns an array containing the keys (or property names) of that object. This functionality allows you to quickly access and manipulate the keys of an object, providing a useful way to enumerate over properties when you need to understand the structure of the object.

For example, if you have an object defined as:

const example = { a: 1, b: 2, c: 3 };

Calling Object.keys(example) would yield:

["a", "b", "c"]

This result can be particularly beneficial in various scenarios, such as iterating over an object’s properties or performing operations based on those keys.

The other options do not accurately represent the output of Object.keys. The method does not return values of the properties, the total count of properties, or only the methods defined in the object. It strictly focuses on extracting the keys, making the selected answer the best representation of what Object.keys does.