Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.javascript > #29640

Re: library for fast map/filter/reduce

Show all headers | View raw

On Friday, February 19, 2016 at 5:44:31 PM UTC+1, Scott Sauyet wrote:

> [...] please do take the
criticism in the positive spirit in which it was intended. [...]

No worries ! That's the way I understood your comments. And thanks for the compliments.

> [...] I always edged my way around Dojo, using it when I was on
> projects that already had it, but never introducing it.  It always seemed
> overblown, a designed-by-committee monstrosity.

Yes... I once removed dojo from a production codebase, thus putting an end to recurring "daytime nightmares". I found comp.lang.javascript particularly useful in that context.

> 
> 
> > Concerning the string lambdas: transfun.js permits both string lambdas and
> > usual functions [...] It is probably a matter of context.
> 
> Perhaps.  I did see that both were available.  To me, though, the string
> lambdas are uncomfortable.  They make me wonder about the overall design.
> If I were to use the library, though, I do understand that I could simply
> choose not to use them.
> 
> These days, ES6 fat arrow syntax helps reduce the verbose nature of lambdas
> in JS anyway, so some of the reason for these may not be so important.  I
> may be missing some of your motivation, though.

One possible motivation is the extra speed - although the speed gain is not as important as the speed gain obtained from eliminating intermediate arrays. 

Another possible motivation is to generate flat code without resorting to function decompilation. 

A third motivation is that I just like to generate code :) More seriously it is nice to be able to look at one piece of generated code, hopefully still somewhat readable.

Side note about lambdas: it would be nice to be able to write some without variables at all. OCaml has an interesting notation where one can wrap an operator + into a function (+) 

> 
> [...]
> 
> Interesting.  I've not worked with D, only read a few articles about it.
> 
> I've always thought of it as a mostly imperative language, and didn't
> even realize that it had functional APIs included.  I can't tell from
> their documentation if the claims from that post are justified or not.
> It would be interesting to know.

I had the same reaction and asked. The answer is yes:

http://forum.dlang.org/thread/pbcwqhfgjghxezpsiblo@forum.dlang.org

>
> [...]
>
> > Side note: transfun.js offers a few selected transformations (especially 
> > the ones I often need), but anyone can write his own:
> > 
> > http://glat.info/transfun/#defining
> 
> That does improve the situation, but still doesn't give the expressiveness
> that I like in pipelines.  It doesn't allow me to use functions on the
> fly, partially applying functions, using lambdas, etc.

Ok. At this point of time I can only say that transfun's transformations support automatic currying - not documented, sorry. I have to look at the other topics you mentionned.

Thanks for mentionning Trine.

Best regards,
Guillaume

Back to comp.lang.javascript | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

library for fast map/filter/reduce glathoud <glathoud@yahoo.fr> - 2016-02-16 22:24 -0800
  Re: library for fast map/filter/reduce Scott Sauyet <scott.sauyet@gmail.com> - 2016-02-18 20:01 -0800
    Re: library for fast map/filter/reduce glathoud <glathoud@yahoo.fr> - 2016-02-19 02:10 -0800
      Re: library for fast map/filter/reduce Scott Sauyet <scott.sauyet@gmail.com> - 2016-02-19 08:44 -0800
        Re: library for fast map/filter/reduce glathoud <glathoud@yahoo.fr> - 2016-02-20 04:03 -0800
          Re: library for fast map/filter/reduce Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-02-20 13:59 +0000
            Re: library for fast map/filter/reduce glathoud <glathoud@yahoo.fr> - 2016-02-23 21:53 -0800
  Re: library for fast map/filter/reduce "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2016-02-23 19:22 -0800
    Re: library for fast map/filter/reduce glathoud <glathoud@yahoo.fr> - 2016-02-23 22:11 -0800

csiph-web