Checking if a variable is an array is essential for type validation, data processing, and preventing runtime errors when working with different data types. With over 25 years of experience in software development and as the creator of CoreUI, I’ve implemented array type checking extensively in data transformation functions, component prop validation, and API response handling. From my expertise, the most reliable approach is using the Array.isArray() method which provides accurate array detection regardless of the object’s origin. This method overcomes the limitations of typeof and instanceof operators for robust array identification.