Add `apply`?

[Dirk Schumacher]

apply(X, 1, fun) => X.each_row(fun)
apply(X, 2, fun) => X.each_col(fun)

But that modifies X in place 🤔

[James J Balamuta]

@dirkschumacher how about a loop structure instead?

I think fun here should have decent coverage under the pre-mapping of R functions and the lambda conversion introduced to handle anonymous functions.