What makes a jQuery object show up as an array in Chrome’s Developer Tools?

From http://api.jquery.com/jQuery.makeArray/:

Many methods, both in jQuery and in JavaScript in general, return objects that are array-like. For example, the jQuery factory function $() returns a jQuery object that has many of the properties of an array (a length, the [] array access operator, etc.), but is not exactly the same as an array and lacks some of an array’s built-in methods (such as .pop() and .reverse()).

Basically, The object has to have length and splice properties to be array-like. Here is a relevant SO question: Array Like Objects in Javascript

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