CODEWITHSUNDEEP
clojure
GitCrush
GitCrush

Reputation: 113

Sort map by value property

I am currently trying to figure out a way to re-arrange entries within an existing map based, on a function apllied to its values, such as count:

(def map1 '{A: (1 2 3) B: (1 2) C: (5) } )

Sort by (count (vals map1))

=> {C: (5) B: (1 2) A: (1 2 3)}

Is there any straight-forward way to accomplish that? Many thanks!

Upvotes: 0

Views: 136

Answers (1)

Martin Půda
Martin Půda

Reputation: 7568

Use sort-by with anonymous function:

(def map1 '{:A (1 2 3) :B (1 2) :C (5)})
(sort-by (fn [e] (count (val e))) map1)
(sort-by #(count (val %)) map1)

or with composition:

(sort-by (comp count val) map1) 
=> ([:C (5)] [:B (1 2)] [:A (1 2 3)])

Upvotes: 3

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