How to check if a JavaScript object is an array?

This video show you how to check if a JavaScript Object is an array.
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[mothergaea]

I miss the intros in your older tutorials where you would say your name and "from Bonsaiilabs, and today we are going to be looking at ect ect ect." Made the video more formal, but had a nice taste of friendliness.

[asagiai]

Is it me or it didn't work if an array is a member of an object literal?

Let a = {
n:[ ]
}

Array.isArray(a.n) // undefined?