Racket threading macro

[Brian Adkins]

I just installed the threading package for Racket, and I'm pretty pleased with the threading macro which provides "pipe"-like functionality. Here are two recent examples:

(define (score word)

  (apply + (~> word

               string-trim

               string-downcase

               string->list

               (map (curry hash-ref points) _))))

(define (word-count str)

  (~> str

      string-downcase

      (string-split #px"[^a-z]+")

      (foldl (λ (word hsh) (hash-update hsh word add1 0))

             (make-immutable-hash)

             _)))

Docs here: https://docs.racket-lang.org/threading/index.html?q=threading

I've been coding up a lot of Racket lately, and pretty much every other day I find another reason to be elated with Racket :)

Brian