Question

In Python there are functions all and any they return true if all or some elements of a list are true respectively. Are there equivalent functions in Common Lisp? If not, what is the most succinct and idiomatic way to write them?

Currently i have this:

(defun all (xs)
  (reduce (lambda (x y) (and x y)) xs :initial-value t))

(defun any (xs)
  (reduce (lambda (x y) (or x y)) xs :initial-value nil))

Answer 1

In Common Lisp, use every (that’s the equivalent of all) and some (that’s the equivalent of any).