Associative array/Merging: Difference between revisions

=={{header|Racket}}==

<lang racket>#lang racket/base

(require racket/hash)

(module+ test

(require rackunit)

(define base-data (hash "name" "Rocket Skates"

"price" 12.75

"color" "yellow"))

(define update-data (hash "price" 15.25

"color" "red"

"year" 1974))

(hash-union base-data update-data #:combine (λ (a b) b)))

</lang>

{{out}}

<pre>'#hash(("color" . "red") ("name" . "Rocket Skates") ("price" . 15.25) ("year" . 1974))</pre>