<=

Conformance: R5RS Scheme

Purpose: Check whether a seqeunce of numbers is in strict non-descending order. Return #t, if a<=b<=... and otherwise #f.

Arguments:
A - number
B... - numbers

Implementation:

(define (<= a . b)
  (letrec
    ((lteq
       (lambda (a b)
         (cond ((eq? a #t) #t)
           ((> a b) #t)
           (else b)))))
    (cond ((null? b)
        (bottom '(too few arguments to <=)))
      (else (neq? (fold-left lteq a b) #t)))))

Example:

(<= 9 9 10) 
=> #t

See also:
digits, <, >, >=, n<=.