Dimension is a functor. This is true for points in space as well as arrays (more concretely).
I ported a Python tutorial to J.
When writing a compiler, one typically annotates the syntax tree in various phases. What the nodes are annotated with will vary over the course of the program; one might add type information during a type synthesis phase.
One of the virtues of J is its conciseness; I think this is underrated in exploratory programming. Here I present some J one-liners alongside samples of other languages.
I stumbled across a comment by András Kovács on compiler performance, which brought up some of the difficulties writing adequate compilers in lower-level languages such as C++ or Rust.
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