[earenndil]

What is TFA?

> the use of "nested arrays" (not the same as multidimensional arrays) induces pointer structures that are difficult to do anything with

J doesn't allow nested arrays by default; if you want to create such a structure, you have to use boxes (and then unbox the values inside of them to get at them), which makes it explicit and reduces its usage. AFAIK, k doesn't have nested arrays at all.