declare

forward declares a binding

Usage: (declare <name>+) (private <name>+)

Forward declares bindings. This means that the names will be known in the current namespace, but not yet assigned. This can be useful when two functions refer to one another.

The private variant makes the binding private to the current namespace.

An Example

(declare is-odd-number)

(define (is-even-number n)
  (cond [(= n 0) true]
        [:else   (is-odd-number (- n 1))]))

(define (is-odd-number n)
  (cond [(= n 0) false]
        [:else   (is-even-number (- n 1))]))