equal?

Conformance: R5RS Scheme

Purpose: Compare two forms. Return #t, if the forms print equal.

Arguments:
A - datum
B - datum

Implementation:

(define (equal? a b)
  (cond ((string? a)
      (and (string? b) (string=? a b)))
    ((and (pair? a) (pair? b))
      (and (equal? (car a) (car b))
           (equal? (cdr a) (cdr b))))
; This is actually caught by eqv? below
;     ((or (procedure? a) (procedure? b))
;       (bottom))
    (else (eqv? a b))))

Example:

(equal? '(a b (c d (e)) f) '(a b (c d (e)) f)) 
=> #t

See also:
eqv?, member, =.