25 lines
624 B
Racket
25 lines
624 B
Racket
#lang slideshow
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(define (my-map f lst)
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(cond
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[(empty? lst) empty]
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[else (cons (f (first lst))
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(my-map f (rest lst)))]))
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(define (rainbow p)
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(map (lambda (color)
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(colorize p color))
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(list "red" "orange" "yellow" "green" "blue" "purple")))
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(rainbow (circle 10))
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(define (rainbow2 p)
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(define (color-mapper gr-obj color-list)
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(cond
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[(empty? color-list) empty]
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[else (cons(colorize gr-obj (first color-list))
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(color-mapper gr-obj (rest color-list)))]))
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(color-mapper p (list "red" "orange" "yellow" "green" "blue" "purple")))
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(rainbow2 (circle 20)) |