Leon Li leontastic
leontastic
/ assoc-clone.rkt
Last active
January 3, 2016 17:49
Clone of Racket assoc built-in function, except uses equal? instead of is-equal?, and returns an error instead of #f if the element does not exist. See here: http://docs.racket-lang.org/reference/pairs.html#%28def._%28%28lib._racket%2Fprivate%2Flist..rkt%29._assoc%29%29
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| ; find-assoc: Any AL -> (listof Any) | |
| ; (find-assoc id al) produces the first element of al whose *car* is equal to id. | |
| (define (find-assoc id al) | |
| (first (filter (lambda (x) (equal? (first x) id)) al))) |
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