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5.2.1 Top level definitions
---------------------------
At the top 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. If <variable> is not bound, however, then the
definition will bind <variable> to a new location before performing the
assignment, whereas it would be an error to perform a `set!' on an
unbound variable.
(define add3
(lambda (x) (+ x 3)))
(add3 3) ==> 6
(define first car)
(first '(1 2)) ==> 1
Some implementations of Scheme use an initial environment in which all
possible variables are bound to locations, most of which contain
undefined values. Top level definitions in such an implementation are
truly equivalent to assignments.
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