As we have seen so far, arrays are all about making it super simple to work with collections of data. This simplicity is partly through the various properties and methods available to us. It is also through the unique ways we have for accessing the data stored by our arrays using the bracket notation. Despite all the awesome things arrays have going for them, since we are still living inside a world whose boundaries are defined by JavaScript, our arrays are still just an extension of the humble Object.
This is a companion discussion topic for the original entry at https://www.kirupa.com/javascript/arrays_and_objects.htm