4.5 Unchanged Forms

(define-struct structid (fieldid ...))

The same as Intermediate’s define-struct.

(local [definition ...] expr)

(letrec ([id expr-for-let] ...) expr)

(let ([id expr-for-let] ...) expr)

(let* ([id expr-for-let] ...) expr)

The same as Intermediate’s local, letrec, let, and let*.

(cond [expr expr] ... [expr expr])

else

The same as Beginning’s cond.

(if expr expr expr)

The same as Beginning’s if.

(and expr expr expr ...)

(or expr expr expr ...)

The same as Beginning’s and and or.

(time expr)

The same as Intermediate’s time.

(check-expect expr expr)

(check-within expr expr expr)

(check-error expr expr)

The same as Beginning’s check-expect, etc.

empty : empty?

true : boolean?

false : boolean?

Constants for the empty list, true, and false.

(require string)

The same as Beginning’s require.