I am new to Racket and have just started the tutorials.
In section 7 "Lexical Scope" of the Quick introduction
http://download.racket-lang.org/releases/6.6/doc/quick/index.html
there is this code:
(define series
(lambda (mk)
(hc-append 4 (mk 5) (mk 10) (mk 20))))
(define (rgb-series mk)
(vc-append
(series (lambda (sz) (colorize (mk sz) "red")))
(series (lambda (sz) (colorize (mk sz) "green")))
(series (lambda (sz) (colorize (mk sz) "blue")))))
I am having difficulty understanding how the numbers 5, 10, and 20
in the first definition
become "sz" in the second definition.
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