While you can pick up the very basics of JavaScript in a day, becoming truly good at it takes much longer. Think of it like ...

In this paper, a method of detecting object outlines and creating surface traces using a low-cost distance measurement array of infrared light-emitting diode (LED)-photodiode pairs is demonstrated.

This looks correct, unfortunately. The reason is that the result dimensionality is 2 and not 1. I.e. you are getting a single array, rather than a 1-D object array that contains an integer array.