Where can I find documentation for the feature function?

The function "feature" can be used to probe how much spare memory there is in a PC.

I want to use this function to probe how much spare memory there is, but I do NOT want it to print out the results to screen, I want it to simply access that information. Does anyone know how I can do that, or where the documentation for that function exists?

To get it to probe the memory stats, simply use the following:

feature('memstats')

Answer 1

[per isakson]

Here: Undocumented feature() function