it was a classic use-case though - to partition a manifold stream

but I had to upgrade manifold to an alpha, because there was a bug preventing stateful transducers from completing correctly

which also made me think that not so many people were using transducers

I had two cases in a python code base where I was like "oh, I need a transducer!" & was gutted

I wrote one in a tech test a while back as well b/c the test had to mock the side effect of a data pipeline and it was a clean way to just smash together a bunch of ops on like a tiny test fixture to demonstrate that the pipeline would eval to the same thing as a known result

but that was a very contrived example, just happened the transducer was a neat one liner

Morning

Why are you all owls?

Owls?

(and "morning!")

Up in the middle of the night!

Ah, yes, some of them were up very late... and you're up pretty darn early for a Saturday... big plans?

@dominicm no idea why, I've always been so though

Morning :)…

@alex.lynham I thought I saw a python transducers lib, 1 sec

https://github.com/cognitect-labs/transducers-python https://github.com/sixty-north/python-transducers

I typically go to bed at 1-2am and sleep in until 8-9 when it's my choice. Feel more alert if I keep that rhythm

7 hours makes me sleepy

@folcon thanks for the link, will have a look. Ended up jury rigging something with a comp function and then having list operations that delegated to granular ops to get a similar result. It was a lot less terse than a transducer, but still much much terser than the standard 'pythonic' solution would have been. Handed over that project to a team of java contractors muddling their way through python so given the absolute brick wall I had explaining the code design in that style (&why it was different from normal python approach) I suspect a transducer would have been a second bridge too far. I have nightmares of the whole thing being rewritten in for loops with classes all over the place already.

Oh dear

Well at least the other day a permie colleague - who had told me that my rambling about lisp had encouraged her to look up her uni fp module (scheme, I think?) - told me she was moving over to that work stream for a bit. She's hella smart so maybe she's the hero that codebase needs

oh, good luck =)…

Well, code is ephemeral really

Given the constraints (python, legacy systems surrounding the edges, big org, lack of engineer hours) it's probably the most elegant thing I've ever designed/built (with some help on the build - a brilliant colleague who now does python but had done some haskell was so much fun to pair with), but unless you're in charge and have people all at a certain level of understanding/a certain mindset, you can't be too precious about what happens when you hand something over

We're just trying to ship things useful to the business after all

Although it is nice when solutions are elegant and scale 🙂

Various versions of scheme seem popular in University. A colleague mentioned PLT Scheme (racket) from University.

Good attitude :)…

I remember Thing geom creator Karsten Schmidt did a lot of his lib and coding work using literate programming, has anyone found any resources about how he setup his environment or has done it for a while themselves?

Using org mode or something else?

Hmm... I pretty much use transducers anywhere I'd use ->>. If there is no reduce step at the end of my thread last, then I use into, if there is then I use transduce.

I think most people get hung up on how they are implemented rather than how easy they are to use.

Yes, that could work, I just don’t really use emacs much these days, cursive works at the moment :)…

That’s interesting @otfrom, I should give that a go as I don’t use them all that much at the moment =)…

Hmmm indeed, that's actually a pretty good heuristic... might have to take that for a spin.

And this post seems to answer my follow up thought of "besides day to day stuff, which has the best performance in what scenario" https://www.reddit.com/r/Clojure/comments/5lhz7q/seq_functions_reducers_transducers_when_do_i_use/

ohh!

morning