@joshua.d.horwitz @eigenhombre @dbernal Just to close the loop here - the default repo is hosted by a Fastly CDN. I suspect they were having some temporary issues.

Thanks @tcrawley!

@emccue try already has an implicit do

when I wrote that macro I used (catch Exception _#)

bodies with nothing in them return nil

eh, but that isnt entirely hygenic that way

if i wrote the macro using the implicit do I could say

I prefer to explicitly return nil, but thats just my taste

not sure if that actually fits how hygiene is defined, but im not googling it

shell script for calling the structural diff library autochrome like git diff.

Library: https://github.com/ladderlife/autochrome Readme: https://fazzone.github.io/autochrome.html

It's so awesome that one can use clj with inline deps like this.

I'm trying to get tools.cli to parse an option with the config: [["-ph" "--proxy-host HOST" "Proxy host"]], but it interprets the short version as two unknown flags -p and -h. Is there a way to make -ph work?

How is unquote bound? I can't see anything from grepping the clojure codebase.

Question about tools.deps / clj . I'm trying to use a :gen-class namespace with tools.deps, but haven't been successful so far. I have to go back to boot to get what I want (i.e. compile a namespace). Is there a way to get tools.deps to support :gen-class namespaces?

@dominicm is this what you’re looking for? https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/LispReader.java#L1157-L1177

quick experiment using tools.deps in docker such that it could be used in a shell script (long story, it makes sense in a specific infrastructure)

justin.smith@C02RW05WFVH6: ~/ledger$ docker run -i clojure:tools-deps-1.9.0.381 clojure -e '(def important :a)' - << HERE
> (defn go
>   []
>   (println important))
> 
> (go)
> HERE
#'user/important
:a

hi guys

how can reset atom to it's default state ?

(def hello (atom {:hello nil :world []}) ; default state

now doing some processing and want to get back to default state again how can i do this?

something like copy object in OOP

you can use reset! if you don't care about what some other thread is doing with the data

to be clear, the "default state" would be a concept in your code but not actually built into the atom itself

(def default-state {:hello nil :world []})

but if i have an atom with default values which behave as initial values

(def hello (atom default-state))

As noisesmith said, this isn't something built into the atom

thanks guys got it

Seems like gorilla-repl is a bit unmaintained these days. Are there alternative notebook style environments that support CLJ/CLJS?

@fingertoe Nextjournal does support both (and is written in it). But support isn’t as easy as we’d like it to be yet, see or remix https://nextjournal.com/schmudde/repl-driven-development for how to add deps currently. If you’d like to give it a try, use the invite code curryon2018 to signup.

is there a good walkthrough of wiring lacinia up to a ring app outside of pedestal? specifically I want to use graphiql and have a schema available like with apollo

I have a windows machine so unfortunately i cant just use the pedestal integration

please remind me someone: what's the syntax for defining fixed arity anon fn, eg. #(foo) with fixed arity, of say 2 args, meant for java interop, there was some special syntax for that, in front of the # or between the # and (, not sure

Hmmm, #(foo %1 %2)?

yeah, but I'm not using any of the args 🙂 that the issue

just side-effecting

I probably can't help. I didn't know you could pass functions into java methods.

yeah, you can, they become Runnable or something, not sure how this works with arguments

Maybe if I saw an example I would understand better.

@skrat, how about (fn [_ _] *do stuff* )

@smith.adriane of course, I'm just nitpicking here, and I'm quite sure there is a syntax for this 🙂

"no one knows about it", not google, but I've seen it somewhere

ah, yeah I had that issue too and I just did what skat did in the past if I recall correctly.

(#(+ 1 2) 1) will throw an ArityException

all clojure functions implement Runnable

user=> (supers (class (fn [_] _)))
#{clojure.lang.IFn java.lang.Runnable clojure.lang.IObj java.io.Serializable clojure.lang.IMeta clojure.lang.AFunction java.util.concurrent.Callable java.util.Comparator java.lang.Object clojure.lang.AFn clojure.lang.Fn}
user=> 

you may be thinking of memfn, but don't think about it, it is a best forgotten thing that existed before the #() short hand syntax did

the only form I’ve seen with the # type of anonymous function is (#(do %1 (+ 1 2)) 1) for specifying arity

user=> (#(do %& (+ 1 2)) 1 2 3 4 5)
3
user=>

but all that is silly, better to use (fn [& _] ...) or similar as already recommended

yeah 🙂 then I'd rather stick to using (fn ...)

yepp

jeeez, there is such a thing!

found it by trying out different things

(#(^%1 + 1 2) 1)

might be a reader hack though, but it works

ugh, no

absolutely not

what's going on there?

guess I'm just adding meta to the +

but the reader recognizes that the %1 is used, and make an arity 1 function

you are type hinting the value returned when looking up the name + with with the gensym the reader creates

absolutely not

this works too (#(#_%1 + 1 2) 1)

less gore

slightly less gross, but still, what are you even doing? just write some code people will be able to read

no I'm definitely sticking with (fn [_] ...), but wound up hacking the reader for fun

the #_%4 side effects the reader even though it is commented out?

cljs$user$thing(p1__50868_SHARP_,p2__50869_SHARP_,p3__50870_SHARP_,p4__50871_SHARP_,p5__50867_SHARP_){
return ((1) + (1)).call(null);
}

#(#_%5 (+ 1 1))

yeah, not sure I'd call it side effecting, but it makes it recognize 4th arguments being used, and creates arity 4 fn

well, it's not an issue in JS, but in JVM it is

a comment that changes the emitted code is side effecting to me

all fns are variadic in JS, there's no checks, but in JVM it throws ArityException

if you provide too few its a problem nvm that a cljs protection

user=> ((constantly (+ 1 2)) 2 3 4)
3
user=>

kinda verbose though lol

sometimes I'll use the #(do ...) for brevity

oh, you're looking for enforced fixed arity for java interop, gotcha

#(do %1 %2 *stuff*) - does that fix the arity?

yes, #(do %2 ...) does as well, but why not (fn [ ] ...)

it's only two characters longer and a lot cleaner