CODEWITHSUNDEEP
clojure
Zhe Hu
Zhe Hu

Reputation: 4007

clojure sort always return a list

To sort a vector in clojure

(sort [ 2 3 1 4])

returns a list (sorted)

(1 2 3 4)

I can turn it back into the vector by

(into [] (sort [ 2 3 1 4]))

which is kind of inconvenient.

But if I sort a map/dictionary in clojure

(sort {2 "" 3 "" 1 "" 4 ""})

the return 

([1 ""] [2 ""] [3 ""] [4 ""])

How do I turn it back into a sorted map? Or is there a better sort function that keeps the type/shape of the input?

Upvotes: 3

Views: 327

Answers (1)

Shlomi
Shlomi

Reputation: 4756

I dont know of a general way to always keep the original type/shape.

In case of a sorted map, its important to know that a regular map in clojure has no order (at least nothing you can or should rely on). For that clojure has sorted-map. There is also a useful function sorted-map-by that allows you to specify your own ordering.

So, in your example:

(into (sorted-map)  {2 "" 3 "" 1 "" 4 ""})
;; {1 "", 2 "", 3 "", 4 ""}

Upvotes: 3

Related Questions