Task

The goal is to create an associative array (also known as a dictionary, map, or hash).



Related tasks:

 Associative arrays/Iteration
 Hash from two arrays


See also

 Array
 Associative array: Creation, Iteration
 Collections
 Compound data type
 Doubly-linked list: Definition, Element definition, Element insertion, List Traversal, Element Removal
 Linked list
 Queue: Definition, Usage
 Set
 Singly-linked list: Element definition, Element insertion, List Traversal, Element Removal
 Stack


 
#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
 