@RubenVerg thanks, I'll get back to factorials in a minute!
Right now I had moved on to Fibonacci, and I had two questions about my solution:
fib2 ← {
⍵≤1: ⍵
1 ↓ ({1 ↓ (⍵,+/⍵)} ⍣ (⍵ - 1)) 0 1
}
First of all, nested parens, which @PaulMansour said are to be avodied. Can I do something like the above without them?
Secondly, I'm using ⍵ in two different scopes, which is also perhaps bad style?