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Top level definitionsAt the outermost level of a program, a definition
(define {variable} {expression})
has essentially the same effect as the assignment expression
(set! {variable} {expression})
if variable is bound to a non-syntax value. However, if
variable is not bound,
or is a syntactic keyword,
then the definition will bind
variable to a new location before performing the assignment,
whereas it would be an error to perform a
(define add3
(lambda (x) (+ x 3)))
(add3 3) ==> 6
(define first car)
(first '(1 2)) ==> 1
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