I&#x27;m not a hardcore JS dev, but it probably has to do with the speed of objects vs. arrays. In most languages, arrays are significantly faster (because they&#x27;re basically one contiguous block of memory).<p>[1] <a href="http:&#x2F;&#x2F;stackoverflow.com&#x2F;questions&#x2F;17295056&#x2F;array-vs-object-efficiency-in-javascript" rel="nofollow">http:&#x2F;&#x2F;stackoverflow.com&#x2F;questions&#x2F;17295056&#x2F;array-vs-object-...</a>