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Editorial Team
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Asked: 2026-06-13T07:41:10+00:00

Trying to rotate a list left in scheme/racket. For example: (rotate-left ‘(abc)) outputs (bca)

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Trying to rotate a list left in scheme/racket.
For example: (rotate-left ‘(abc)) outputs (bca)

Here’s ze code!

(define (rotate-left LIST)
    (if(null? LIST)'()
        (cons(car LIST)(cons(cdr LIST)'())))))

Unfortunately this just outputs the same list! Should be an easy fix I’m sure, and I know I’m close…Thanks for any help !

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1 Answer

  1. Editorial Team

    You got car and cdr backwards ! Here you go :

    (define (rotate-left LIST)
    (if(null? LIST)'()
        (cons(cdr LIST)(cons(car LIST)'())))))
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