Question

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

I am writing a very small, jQuery-like, DOM wrapper in JavaScript, containing only the (few) functions I need most. I have noticed that, when I log a jQuery object to the console of my browser, the object is actually an array. For example: [Document]. I would like to copy that behavior. Can anyone explain me how jQuery does this internally, or even better point me to some relevant lines in the jQuery source code?
I know that objects and arrays in JavaScript have much in common, but jQuery seems to return true arrays for the $ selections, not objects.
I have already read the following post on stackoverflow but it doesn’t seem to answer my question:

Are javascript Arrays actually implemented as arrays?

Answer 1

The magic is in the presence of:

• length
• splice

prototyped object members. Development consoles print objects that implement these two members as if they were arrays.

var myArray = function() {};
myArray.prototype.length = 0;
myArray.prototype.splice = function(){};

console.log(new myArray)