[racket] Calculating cumulative sum of the list

NOTE TO EVERYONE: The OP asked for "without usage of any libraries". 
I am sure that sooner or later we will find a library so that we
can say (require lib/cumulative) cumulative-sum. 



On Jan 22, 2015, at 7:16 PM, William James wrote:

> Here's a way using map-accum in Gauche.
> 
> (use gauche.collection)
> 
> (define (cumulative-sums xs)
>  (map-accum (lambda (x sum) (values (+ x sum) (+ x sum))) 0 xs))
> 
> (cumulative-sums '(1 3 5 7))
> ===>
> (1 4 9 16)
> 
> 
> --------------------------------------------
> On Thu, 1/22/15, Alexandr M <rus314 at gmail.com> wrote:
> 
> Subject: [racket] Calculating cumulative sum of the list
> To: users at racket-lang.org
> Date: Thursday, January 22, 2015, 7:53 AM
> 
> Hello,
> 
> I am trying to replicate functionality of this code in
> Python:
> 
> https://gist.github.com/m-blog/22b7c5d31b3839ffba50#file-cumsum-py
> 
> in Racket without usage of any libraries.
> 
> What would the most optimal / concise way to do it in
> Racket?
> 
> Thank you.
> 
> -- 
> Best regards,
> Alex
> 
> 
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