Delete element from List in Scheme

Question

I have list in this form

( (1 3) (2 2) (3 1) (4 5) (5 1)))

and I want to delete an item let\'s say (3 1)

So the result wi

Answer 1

The procedure already exists:

(remove '(3 1) '((1 3) (2 2) (3 1) (4 5) (5 1))))

Otherwise your procedure should look like this:

(define (deleteItem item list) 
  (cond 
    ((empty? list) '())
    ((equal? item (car list)) (cdr list))
    (else (cons (car list) (deleteItem item (cdr list))))))

You missed:

• the base case, (empty? list)
• the "else" in the final clause

and you shouldn't use list as a variable name because it shadows the build-in procedure list (but it will work).