A few seconds ago, Veer wrote:
> I don't get it , can you explain in terms of environment and
> interpretation .
`define' is defining a potentially recursive value, so that
(define (loop) (loop))
works as you expect. In simple terms, you can think about an internal
define as something that expands to a `letrec'. So what you wrote is
basically the same as
(define (make-color color)
(letrec ([color color])
...))
The scope of a `let' binding covers the body expression(s), and the
scope of a `letrec' binding covers the initial expression too.
> The simplistic view that I have is : The body of a function executes
> , it encounters define form so expression part of define is
> evaluated and bound to identifier part of define in a environment ,
> it then encounters the identifier color and then value of color is
> returned.
That would be a `let' behavior, which internal `define's don't use in
racket. (Or in any scheme.)
--
((lambda (x) (x x)) (lambda (x) (x x))) Eli Barzilay:
http://barzilay.org/ Maze is Life!
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