Seems kinda trash tbh. Like the concept I love, I would love a cross-language "by examples" learning resource and snippet repository beyond SO. But looking through there most of the function options are trivial problems. The ones that aren't one or two lines mostly have broken code that passes very few tests. The weird Z naming of function and variable makes it totally unreadable. The "composition" option is barely comprehendable and beyond that I only see two language options so it can't even serve as a "rosetta stone".