How to use map, apply, concat and mapcat in Clojure

Clojure has tons of cool functions to help you work with maps and sequences. Here I cover mapcat by showcasing map, apply and concat along the way :)

[CalvaTV]

It is so good with these videos digging in to the core of Clojure, showing how the individual pieces work and how to compose them.

Have you had a look at reducers? It’s basically parallelization for free.

[hayathbasha]

You are amazing 😎
Thank you so much for fullfilling my request😇

[_ooooak]

Thanks, I would love to see more content on pedestal.

[emmanuelaremu]

Thanks for your videos. Pls can you run a code that runs every 10 minutes and prints the current time every 10 minutes (ie. looping)

[eugenej.]

(def numbers [1 2 4 3 1])
(map vector numbers numbers) => ([1 1] [2 2] [4 4] [3 3] [1 1])
(pmap vector numbers numbers) => ([1 1] [2 2] [4 4] [3 3] [1 1]) - this one will use multi-treading on large collections and semi-eager (works in batches)
(mapv vector numbers numbers) => [[1 1] [2 2] [4 4] [3 3] [1 1]] - same but returns vector also it's eager since you can't return a vector in parts. Map and pmap return clojure.lang.LazySeq that generates values on demand.