Arc Forum | After reading http://arclanguage.org/item?id=4703, I wanted to be able to say bo...

Arc Forum

2 points by akkartik 4071 days ago | link | parent

After reading http://arclanguage.org/item?id=4703, I wanted to be able to say both:

  (map f (keep f (sort > ..)))

and:

  (map :over seqs
       (fn (f) ..))

But I can't do that. The ways that wart gets in the way are instructive:

  def (map f seq|over)
    ..

Lesson: when adding param aliases we need to update all later extensions. That seems painful.

b) Even after I identified both places to modify, it's unclear how to deal with this declaration:

  def (map f ... seqs)

I could make it:

  def (map f ... seqs|over)

But then this call combines all args into seqs.

  map :over fs
      (fn (f) ..)

Lesson: rest args by keyword sometimes don't work well. Better to try to find the right names for other args.

Maybe something like this?

  map fs :do (fn (f) ..)

I still can't think of the right keyword to make this readable.

Update: I ended up going with

  map fs :with (fn (f) ..)

I also made a change to permit keyword args after rest keyword args:

  map :over fs :with (fn (f) ..)

Which of these do people prefer? Any other options?