What are people's favorite symbols to use with as->? I kinda like (as-> _), but I'm curious what others' thoughts are.

(as-> 1 _
  (* _ 100)
  (/ _ 2)
  (str "100/2" "=" _))

It's definitely a deviation from the standard of _ being used for ignoring, which I suppose could lead to confusion.

at work we always use <>. Its distinctive, most probably not conflicting with anything else

I've been using %

I use % too

Interesting, I haven't run into either of those.

https://github.com/bbatsov/clojure-style-guide/issues/164

_ seems like a bad choice to me

everywhere else _ means "ignore me"

@bronsa That's the one thing I was concerned with.

sorry I didn't read the message where you say exactly that

Anyways, if anything thinks of other common symbols, please add them to that issue. I think it's worthwhile seeing what's most common.

@bronsa No worries; it's good to know that you had the same thought.

% is certainly growing on me. I didn't like it at first, due to possible confusion with anonymous functions, but it feels right.

I use it precisely because it recalls % from anon fns

i guess you can't use anonymous functions in this then

you can - % in the context of #() is a reader macro so they don't conflict

Hmm. I don't like that.

yeah it definitely looks goofy to me too but I haven't settled on anything better.

I agree that _ iss Not The Thing because that's for ignored values. I've seen some people use $ for the purpose.

I mean, you generally don't do much HOF stuff in -> ime

so the shadowing issue with #() is not problem in practice more often than not

I’ve seen people use <> but I’m not crazy about that either.

Bleh I don’t have backtick on my phone

< >

That minus the space

yeah the old swiss-arrows library gave you -<> which was as-> <> and that worked but I agree with Tim didn't look great.

https://github.com/rplevy/swiss-arrows

Hey Clojurians, I'm looking for a detailed reference for core.async I know about https://clojure.github.io/core.async/ and https://github.com/clojure/core.async/blob/master/examples/walkthrough.clj but looking for more detailed coverage

I’m uncertain about the convention to postfix with ?. Would you use it with all boolean values or only predicate functions that return a bool?

can I treat a plain old function map as a protocol? I have this code

(defprotocol Foo
  (bar [this]))

(def foo-impl
  {:bar (fn [this] "beyond all repair")})

(def foo-impl-shim
  (reify Foo
    (bar [this] ((:bar foo-impl) this))))

besides reagent / reframe, what is the closest clojure lib to https://github.com/papers-we-love/papers-we-love/blob/master/design/out-of-the-tar-pit.pdf ?

Does anyone know how to pass properties (like -Dclojure.compiler.disable-locals-clearing=true) to clojure wrapper script?

from what I gather from the docs, use -O:Dclojure.compiler.disable-locals-clearing=true

https://clojure.org/reference/deps_and_cli#_usage

should be -J-Dclojure.compiler.disable-locals-clearing=true

Made it work: clojure -J-Dclojure.compiler.disable-locals-clearing=true

-O is for activating jvm opt aliases

Thanks Alex 🙂 For some reason, I first tried -JDclojure...

How are people using protobufs in their Clojure apps? Do you just compile the classes manually? clojure-protobuf et. al. don't really seem to be maintained anymore, and i'm always finding version conflicts with other libs that use protobufs.

Riemann being one such lib

@danielstockton Good question, and I echo your sentiment of unmaintained libraries. I am using protobuf in my starcraft II AI clj project. It's way hacky what I did.. But it works out in the end: - I generated the java classes with the proto cli. - Use the main (dated) repo that does clj<->java protobuf stuff '(org.clojars.ghaskins/protobuf "3.3.1-1") It started giving me trouble with some of the used syntax in my the SC2 api proto files. Specifically some kind of enums/oneOf IIRC. - Found/editted .ebnf of .proto and read all the proto specs. Turned those into Clojure.specs. - Wrote a function that reads namespaced datastructures (based on these clojure.spec) and creates the related java builders and calls the setter methods, using reflection and string guessing of the method names.. - The deserializing works with the protobuf library, just not namespaced but that's okay.

code at: https://github.com/bbss/cljsc2 Some example of it in use: https://bbss.github.io/cljsc2/

Still working a lot on it. But the proto pain is gone and haven't had any issues with my hacky approach for a while. Spec is really awesome here. I can use cider to walk through the spec, even when that spec spans multiple files, can just walk the nodes 🙂.

Oh nice, my stuff started working with the ghaskins protobuf lib (i was using flatland version). Thanks!

I think they've updated it to proto3 and it doesnt have a dependency on lein-protobuf anymore

Good to hear! Smooth sailing from now on 🤞

hi everyone. what code editors / IDEs do you use for clojure?

Intellij IDEA + Cursive

I already used it for Java, Ruby and Python, so finding a plugin that did Clojure as well was ace. Pity I had to pay extra for it though 😉

See http://blog.cognitect.com/blog/2017/1/31/clojure-2018-results in particular the 2nd section

I think I’ve tried everything but can’t settle down with one 😄

I’m a vim guy and I’ve been using Spacemacs

vim + vim-surround + vim-parinfer

There's a few vim guys in this team using... fireplace I think

vscode + parinfer + Clojure (Lisin)

In a former life I was a sys and net admin, so I prefer to keep my vim plugin free. Then I can just copy my .vimrc to any server and it works as I expect

Emacs+CIDER

I’ve tried that too, but I really really like the parens editing functionality in Spacemacs. it really speeds things up. but Spacemacs looks horrible 😄 no matter what theme I use, it’s just .. I don’t know

I’m considering Emacs now but I’m so used to vim keybindings, it’s so difficult to switch

Emacs + Evil mode is what you want for the bindings

I tried plain emacs but could never get it set up how I wanted it, I'm a Vim fan and settled on Spacemacs

(may go back to Vim though some day soon...)

I use both Emacs and Vim for a few different Lisp dialects including Clojure, and while I really love vim after using it for a couple decades, I will say that CIDER and the Emacs tools for working with Lisp are much better and more mature. So I tend to use both 😞

I use nc and rebel-readline 😉

Atom is coming along. I do most of my repl interactions outside the editor, so I just need convenient paren management in my editor

I may try out zoakes nightlight thing sometime

if you think spacemacs is ugly, you're not gonna like vanilla emacs

but this might be better in #beginners

There's also an #editors channel for general IDE/editor discuss...

do leiningen exclusions work for plugins?

I was so close to actually using juxt in a real scenario:

(defn abbrev-full-name [name]
  (let [[fst sur] ((juxt first last) (clojure.string/split name #" "))]
    (apply str fst " " (subs sur 0 1))))

(abbrev-full-name "luke horton")
=> "luke h"
(abbrev-full-name "luke w horton")
=> "luke h"
(abbrev-full-name "luke a  bc  def     horton")
=> "luke h"
(abbrev-full-name "luke")
=> "luke l" ;;; noooooo!

I wish there was essentially something like fnil but more like … fnot-the-right-number-of-args?

https://github.com/golang/proposal/blob/master/design/24301-versioned-go.md

This seems interestingly related to Rich's dependency talk with the "give different/incompatible modules different names"

As it seems to force the major/compatibility version number into being part of the name of the module

Not surprising. Pushing versions into the module system is kinda the only way to really get this right.

does [1 2] waste 30 * 4 = 120 bytes of memory since we create an array that can hold 32 refs, but only use 2 of them?

no

https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/PersistentVector.java#L84-L87

oh, TIL, I never noticed that optimization