CODEWITHSUNDEEP
clojure
Caleb Macdonald Black
Caleb Macdonald Black

Reputation: 1582

Point-free way to map the values of the values in a seq

What is a simpler way I can write this:

(map #(map first %) [[[1 2] [3 4]] [[5 6]]])
 => ((1 3) (5))

Usually there are simpler ways to do this. I'm just not sure what.

I'm looking for a point free solution. Specifically this part (map #(map first %) coll).

Upvotes: 0

Views: 85

Answers (1)

Carcigenicate
Carcigenicate

Reputation: 45806

A point-free function expressing this would be:

(def firsts (partial map #(map first %)))

or to go fully point free:

(def firsts (partial map (partial map first)))

Used like:

(firsts [[[1 2] [3 4]] [[5 6]]])

Whether or not this is "simplified" though is subjective. I prefer the non-point-free version myself.

Upvotes: 2

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