I'm not really versed on JavaScript. I presume this is a joke about the lack of a proper array structure in JavaScript? How would one answer this question anyway?
This is probably intended to be a joke about how Javascript was originally developed over about 10 days, which has been the root of many of JS's problems.
But this heritage produced, years later, a great presentation about the evolution of JavaScript... that was best viewed without JavaScript.
While it's probably joke, JavaScript's Array is fine (although it's more like a 'vector'). JavaScript VMs implement it as a real array (in fact, plain objects are often optimized into arrays too).