hello all! supposing I have a vec of maps like [{:key false} {:key true}] what would be the idiomatic way to sort it by truthyness of the key index?

also the other order:

(sort-by (complement :key) [{:key true} {:key false} {:key true} {:key false}])
({:key true} {:key true} {:key false} {:key false})

I was having trouble figuring out I'd have to use complement in this, thanks @rauh and @sundarj

Somebody know better solution than this? or nicer? (t/in-seconds (t/interval (c/from-long 1) (c/from-long 61037)))

I use clj-time. I got the elapsed time in unix format (seconds).

Later I would like to get the mins too etc.. now I use just /1000 division.

Hi. It's been a while since I used clojure, and I forgot how to approach this: I edit a source file with a deliberate syntax error to make sure the project is compiling, and lein check spots the error whereas lein compile seems to do nothing, it immediately returns without spotting the error

Any ideas how to approach this?

As much as it matters, it's a library project (meaning, no main)

SO: https://stackoverflow.com/questions/48344484/clojure-library-project-doesnt-compile-with-updated-source

in theory, if i deploy a clojure project to clojars, i should be able to include that jar as a dependency in a java project, right?

Yes, but you need a bit of stuff to make it usefull, and add least add the clojars repo, to the versioning system you use, so add a repository section and url in you pom.xml when using maven for example

so far it works and the clojure project (a web app server) is running from gradle. but when i try to access it via http i get an error about project.clj missing...

[main] INFO org.eclipse.jetty.server.ServerConnector - Started [email protected]{HTTP/1.1}{0.0.0.0:5005}
[main] INFO org.eclipse.jetty.server.Server - Started @6161ms
18-01-19 13:53:59 kermit INFO [bluegenes.server:32] - Bluegenes server started on port: 5005
[qtp2091367901-32] WARN org.eclipse.jetty.server.HttpChannel - /
java.io.FileNotFoundException: project.clj (No such file or directory)
        at java.io.FileInputStream.open0(Native Method)
        at java.io.FileInputStream.open(FileInputStream.java:195)
        at java.io.FileInputStream.<init>(FileInputStream.java:138)
        at $fn__10968.invokeStatic(io.clj:229)
        at $fn__10968.invoke(io.clj:229)
        at $fn__10881$G__10874__10888.invoke(io.clj:69)
        at $fn__10980.invokeStatic(io.clj:258)

https://clojure.org/reference/java_interop#_calling_clojure_from_java haven’t tried it myself yet

i have no clue why or how project.clj is even relevant in that stack trace, especially since the server successfully started

thanks @gklijs i'll give that a read through again

yeah, that’s weird

would AOT have anything at all to do with it?

nvm that was a silly question

clearly something is reading your project.clj. that seems a weird thing to do though.

yup, you're completely right. it looks like we're slurping in the project's version and providing it via an endpoint (for checking api compatibility)

mystery solved, thanks

project.clj makes it into the uberjar but not the skinny jar, hence the reason we're only seeing the error now

channel-for-each looks good (I've called this function sink or drain before). L6 when-let need to be when-some (because false is a valid value to come over the channel. channel-map has the disadvantage that the map-fn cannot be side-effecting because channels run transducers inside the "channel mutex"... which has restrictions

@jayzawrotny I think they could be a macros, because they don't return anything.

@rgorrepati The for each function doesn’t so could be a macro but the map function returns a channel though?

@jayzawrotny yep.. you are right

Hi guys, Is there any kind of resource that shows the organization of functions with color-coding, etc? I'm new to clojure/lisp and understand the syntax with simple functions. But for the higher-order stuff with functions of functions of functions, I get lost.

there's usually a rainbow brackets plugin depending on your text editor @marcpianelli

hi

has anyone a good example on how I create an easy login-form with sessions on luminus with re-frame? I am trying to grok that, but don't get it.

I want to do it like https://github.com/jacekschae/conduit but don't get the server-part

Are the docs wrong? It looks like the definition of it doesn’t actually return a channel https://github.com/clojure/core.async/blob/2afc2dc5102f60713135ffca6fab993fb35809f0/src/main/clojure/clojure/core/async.clj#L631

go-loop is turned into a go and loop. you can see that go returns a channel here https://github.com/clojure/core.async/blob/68e4620a2daaa323595b7371e2692ebd204f7fba/src/main/clojure/cljs/core/async.clj#L4

Ack you’re right, my mistake! Though now I’m once again uncertain why that above snippet doesn’t work as expected.

@jayzawrotny its because you are taking from the channel returned by onto-chan instead of taking from c

the channel returned by onto-chan just lets you know when it is done

change the $ on line 10 to c and i think it will do what you expected

I want to build a static website and I'm a beginner. Does anybody have a tip on a simple (beginner-friendly) and elegant tool?

hi there, first very small task with clojurescript. Have a html with forms to be filled by numbers, calculate some numerical operation based on them and return the result to be printed in the html

have already set up clojuerescript + figwheel, any very small example on how to do this?

@lum could you back up and explain what you are trying to do, because it kind of sounds like you are asking how to do basic frontend web design, but maybe i misunderstand you

hi @lee.justin.m, I've been learning Clojure, but need to do this very basic ClojureScript "project". A user writes some numbers in html <input> fields, and after some calculation done, some result should be printed in the same html page, in some part of it (<p> for example)

I have the input fields and a button setup in html

@lum try this tutorial https://github.com/jonase/reagent-tutorial

now, to read from the input fields, through their id attributes, how to do it?

I know nothing of React, do I really need it?

you need something to manipulate the dom. your only other real choice is direct calls to the dom (not recommended) or maybe something like jquery. but really, you can get the hang of reagent without knowing react for something as simple as what you are trying to do

ok, I've done some javascript some years ago, and could access (and set) the DOM directly, thought could do it with no problems in ClojureScript as well

if it is truly dead simple, you could put an empty <p> in your webpage and then, in your form’s onsubmit handler, call getElementById on it and put something inside that <p>

call it like .js/getElementById "something"?

okay yea if you are familiar with that, you can just call (.getElementById js/document "myid")

or (js/document.getElementById "myid") works too and is more javascripty

and to set that <p>?

actually i don’t know the dom calls very well, i’m sure you can google them on mdn. they work exactly the same in clojurescript

fine, this is just something very simple, just to start. Thank you very much @lee.justin.m

one more thing: after (.getElementById js/document "dia"), I get back #object[HTMLInputElement [object HTMLInputElement]]

how to get the contents of it?

(.innerHTML ...) checkout https://developer.mozilla.org/en-US/docs/Web/API/Element

wouldn’t it be (.-innerHTML ...) since it’s a property?

oops! thanks yes. i still screw that up on a regular basis

do you mean: (def dia (.getElementById js/document "dia")) and then (.-innerHTML dia)?

right but in real code you probably wouldn’t put that in a def. You can do it in one expression with (->> "dia" (.getElementById js/document) (.-innerHTML))