Mapping to a nested list, function applies to quote

Question

I have something like this

(map (lambda (l) (apply + l)) '('(1 2) '(3 4)))

I expect '(3 7), however I get an error saying that the applied function gets applied to a quote. Why does this happen?

When I was a beginner in racket I did have this issue, so it is useful for newcomers to racket. Don't know why it was downvoted :/ — Lazerbeak12345, Sep 21 '20 at 16:43

score 3 · Accepted Answer · answered Sep 20 '20 at 00:23

The list I had was equivalent to

(list (quote (list 1 2)) (quote (list 3 4)))

and not

(list (list 1 2) (list 3 4))

The list was malformed. For the difference between list and quote see this post: What is the difference between quote and list?.

A proper way to do nested loop is like '((1 2) (3 4)).

1 Answers1