Functional Programming: This thread is like a burrito

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The Something Awful Forums > Discussion > Serious Hardware/Software Crap > The Cavern of COBOL > Functional Programming: This thread is like a burrito

Horse Clocks: Dec 14, 2004

Barnyard Protein posted:

Does anyone know of a racket function/macro that does something like these clojure operators?

http://clojuredocs.org/clojure.core/-%3E
http://clojuredocs.org/clojure.core/-%3E%3E

The clojure docs use the word "thread" to describe the behavior, which is a good word to use except for the fact that there is another more common thing that uses that same word so its hard to search for.

Out of boredom I took a stab at implementing thread-first as a function. I got close, but don't know much about rackets quoting/unquoting, so the syntax is dumb.

I also don't have racket installed, so I'm using try-racket.org and I want to stab my hands to death.

Lisp code:

(define (thread-first value functions)
  (if (eq? (length functions) 0)
    value
    (let* ([head (car functions)]
           [tail (cdr functions)]
           [func (car head)]
           [args (cdr head)])
      (thread-first 
        (apply func value args) tail))))

(thread-first 0 (list (list + 1)
                      (list * 2)
                      (list / 4)))
1/2

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The Something Awful Forums > Discussion > Serious Hardware/Software Crap > The Cavern of COBOL > Functional Programming: This thread is like a burrito