I remember a javascript library where the was a function that returned, according to the documentation, “a color”. Did it return an object with 3 fields? Were those fields RGB or some other color scheme? Is it a string encoding a color? What format is that string? None of these questions could be answered without just running the code, and analyzing the object you got back.

I have one of these too for my cat, and it works really well. Hasn’t run out of batteries yet since I bought it several months ago. And it stopped the catfood thieves of the neighbourhoud entering my kitchen uninvited.