[racket-dev] PLaneT Library of Iterations/Comprehensions

From: Dave Gurnell (d.j.gurnell at gmail.com)
Date: Tue Aug 24 03:55:14 EDT 2010

I use these guys all the time:


No guarantees that I'm not duplicating other peoples' efforts.


-- Dave

On 22 Aug 2010, at 07:26, Noel Welsh wrote:

> Hi Will,
> My "numerics" package on Github has for/vector with some slight
> extensions to yours. I think it also has more error checking so you
> might want to look at it. I also have for/fold/vector and some
> sequence abstractions. The code is all parameterised at expansion time
> by the vector representation.
> http://github.com/noelwelsh/numeric
> N.
> On Wed, Aug 18, 2010 at 5:02 PM, Will M. Farr <wmfarr at gmail.com> wrote:
>> Hello all,
>> I've been thinking for a while about putting together a PLaneT library of some iteration/comprehension forms that I often use that are not found in the racket core.  Right now, I have a small it-comp.plt local PLaneT package that contains
>> for/vector
>> for/flvector
>> in-flvector
>> The for/... forms have the option of having a first expression that gives the length of the resulting object (similar to srfi-42's vector-of-length-ec form) to allow generating more efficient code:
>> (for/vector ((x (in-range 3))) x) => (vector 0 1 2)
>> (for/vector 3 ((x (in-range 3))) x) => (vector 0 1 2) ; but more efficiently
>> I'll be adding more forms from time to time, as I need them.  Eventually, I'll release this to PLaneT, but I thought I might ask the community two questions first:
>> 1. Am I duplicating the functionality of some library?  (If so, I'll just contribute to that instead.)
>> 2. Do you have any iteration "favorites" that I should include in the library?  (Code welcome, but I'm also happy to implement suggestions myself.)
>> Alternately, if you guys want to add these to the core, I'd be happy to contribute code and tests....
>> Thanks,
>> Will
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