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→{{header|Racket}}
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</lang>
=={{header|Racket}}==
Racket comes with a standard <tt>sort</tt> function, which is documented [[http://docs.racket-lang.org/reference/pairs.html#%28def._%28%28lib._racket%2Fprivate%2Flist..rkt%29._sort%29%29 here]]. It is documented as stable.
<lang Racket>
#lang racket
(sort '(("UK" "London")
("US" "New York")
("US" "Birmingham")
("UK" "Birmingham"))
string<? #:key first)
;; -> (("UK" "London") ("UK" "Birmingham")
;; ("US" "New York") ("US" "Birmingham"))
(sort '(("UK" "London")
("US" "New York")
("US" "Birmingham")
("UK" "Birmingham"))
string<? #:key second)
;; -> '(("US" "Birmingham") ("UK" "Birmingham")
;; ("UK" "London") ("US" "New York"))
</lang>
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