clojure-nl 2022-08-04 | Slack Archive

Morning

👋 3

Is it possible to make this shorter?

(filter #(and (= "F" (:type %)) (= 61170 (:id %))) matrix)

You could make it shorter, but I wouldn't bother as the code would likely become more obscure

✅ 1

Indeed, looks pretty short and clear to me.

✅ 1

Except, if you can use juxt of course: (filter (comp #{["F" 61170]} (juxt :type :id)) matrix). Just kidding.

And throw in a transducer for good measure:

(def my-filter (filter (comp #{["F" 61170]} (juxt :type :id))))

(transduce my-filter conj matrix)

Good ol transducers

Good to know I made it short already 🙂

juxt works even better for multiple filters thanks! still need to wrap my head around juxt..

Can someone explain why

(map #(into ["A" %]) [1234 5678])

is faster then

(for [i [1234 5678]] ["A" i])

When I macroexpand both of them the for loop has about 20+ lines and the map has only 1

Isn't that the explanation already? ;)

hehe good point

2022-08-04