|
#lang racket
|
|
|
|
;; a-lists
|
|
(define a-list '((a . 5) (b . 10)))
|
|
(assoc a-list 'a) ; => '(a . 5)
|
|
|
|
;; hash tables
|
|
(define table #hash((a . 5) (b . 10)))
|
|
(hash-ref table 'a) ; => 5
|
|
|
|
;; dictionary interface
|
|
(dict-ref a-list 'a) ; => 5
|
|
(dict-ref table 'a) ; => 5
|