It's VSO, there is always an operator (six of them), the subject [1] is always a path, and the only one missing an object is remove, which of course has none.

It's VSO, there is always an operator (six of them), the subject [1] is always a path, and the only one missing an object is remove, which of course has none. Here: const [op, from, to] = patch Now you can read it again. If you want to hashmap from {+, -, !, |, >, ?} to words, that's understandable. Edit: We could simplify this to five verbs by letting + take one or two arguments, where the 1adic form sets the value to null. I mean I wouldn't, but we could.