What is the difference between enumerable and non-enumerable properties in JavaScript?

Can you explain the difference between enumerable and non-enumerable properties in JavaScript?

Sure! In JavaScript, enumerable properties are those that can be iterated over in a loop, like with for...in. Non-enumerable properties, on the other hand, are not included in such iterations.

How can I check if a property is enumerable or non-enumerable?

You can use the propertyIsEnumerable() method to check if a property is enumerable. For example, obj.propertyName.propertyIsEnumerable() will return true or false.

Can you give me an example of each type of property?

Certainly! An example of an enumerable property is a regular property added to an object. A non-enumerable property can be created using Object.defineProperty() with the enumerable attribute set to false.

Why would I want to use non-enumerable properties?

Non-enumerable properties are useful for hiding implementation details or internal state from loops and external access, providing better encapsulation.