@bensu :min-lein-version is optional only

although Heroku uses it to pick a Lein2

I think you would need to upgrade it yourself if you wanted a specific version

Somehow, lein repl stopped working. It now gets “REPL server launch timed out”. Is this something someone’s seen?

Resolved. Top-level synthesizing bad keywords. Still not sure why it timed out, though.

What did go wrong here : https://www.refheap.com/112122 when I send (@account) to the repl in Cursive I see this error message : (@account) CompilerException java.lang.ClassCastException: java.lang.Long cannot be cast to clojure.lang.IFn

You are calling account as if it was a function. Wrapped in parens (@variable) @variable is treated as a function, in first place onside the parens.

@roelof

Thanks, I never knew you could send things to the repl without ( )

and I see there is another error somewhere account is still zero 😞

@alexmiller: I saw this page linked from a blog post: http://dev.clojure.org/display/doc/IDEs+and+Editors and I noticed didn’t contain Cursive.

@roelof Your anonymous function: (fn [x] (+ x)) probably should add something :) (+ x) not sure what it does, not at a repl (+ x 1) adds one

What I want to achieve is that the amount is added up with the agent account

@roelof (+ x x) ?

@roelof (def a (agent 0)), (send a #(+ % 2))

@borkdude: I have made the agent earlier with (def account (agent 0 :validation number?))

@roelof: well, then replace a with account 😉

I thought so

@roelof: the agent receives a function of the old value to a new value

so (fn [old] (+ old 2)) works

#(+ % 2) is the same function

@borkdude: I know

when I do this : (send-off account (send account #(+ account amount)) ) I see this error : CompilerException java.lang.RuntimeException: Agent is failed,

@roelof: why are you using send-off and send?

According to the programming clojure book send-off is sending the message 1 times where send sends it several times

one time is enough

I don't think that's correct. Use either send or send-off but not both

send-off is for potentially blocking operations

also (send ...) is not a function. send-off expects a function as the second argument

oke, I will change my code

I must go. good luck

Thanks for the help

Still errors . Anyone else who can help me with this code : https://www.refheap.com/112123

@roelof: do you mean :validator ?

nha : you are right. I checked it with the "programming clojure" book

@roelof: never used agents, but the doc is there : https://clojuredocs.org/clojure.core/agent

(quite sure you know this, but just in case )

I know, I change it but still the same error : CompilerException java.lang.RuntimeException: Agent is failed,

found it, I had to change my function to (send account #(+ % amount)))

Is this paper about more efficient collections exciting or old news: http://blog.acolyer.org/2015/11/27/hamt ?

@tomayerst I think it's actually being looked at according to @alexmiller, if I remember correctly

is there some handy tool to log the arguments of a function call + the names of the arguments

instead of manual println it

@borkdude: https://github.com/spellhouse/clairvoyant — cljs only still ...

@martinklepsch: JVM wanted, but I'll take a look anyway

maybe good old https://github.com/clojure/tools.trace does the job

@borkdude: https://github.com/clojure/tools.trace

oh

I could provide it in my dev-dependencies

(and don't forget to remove the traces when deploying)

is it possible to "find all references" of a function? in emacs/cider?

@borkdude: have you got clj-refactor installed?

if you have it’s ‘cljr-find-usages'

I have clj-refactor prefix bound to C-c <RETURN> then ‘f u’ for find usages.

If you just want to go to the defn or def of a var you can use CIDER by placing cursor on symbol and using C-c M-.

You use C-c M-, to return to where you were

As you’re coming to ClojureX why not talk to @benedek about clj-refactor. He’s one of the authors. Also @bozhidar (CIDER author) will be there too.

haha thx @agile_geek for the promotion 😉

@agile_geek: apparently not, I'll try it now.

And sure 😄

@benedek: my pleasure. 😉

clj-refactor is full of so many goodies that are hard to find.

@borkdude: it’s a missing piece of the emacs/clojure/cider puzzle!

@chris we recently added hydras (as in https://github.com/abo-abo/hydra) for easier discoverability, see screen cast here: https://github.com/clojure-emacs/clj-refactor.el/wiki/Hydra

yeah, I had it installed before, but then it got lost during an upgrade

ah, refactor-nrepl middleware...

@benedek: cool. I think I’m a couple of versions behind!

thanks. I watched @magnars parens-of-the-dead and I was amazed by all the things that clj-refactor could do that I had never even seen, and I’m sure there’s a bunch more in there I haven’t even discovered yet

it also has the added benefit of (1) staying open for a refactoring ‘session’ and (2) ‘teaching’ you the same keycombo-s you can use with your predefined prefix

i think this is in the 2.0-SNAPSHOT

I hope it's compatible with cider-nrepl 10.0

our wiki is quite complete as well with screencasts etc although naturally it refers to the latest snapshot

@borkdude: the latest snapshot is

in fact i think you need to have cider 0.10-SNAPSHOT

I have cider snapshot

so I'll use 2.0.0-SNAPSHOT then

yup that should be a good combination 😉

it also depends on clojure 1.7

I'm using that

coolio then

has some cljs support too. for example clean-ns works for cljs nses

cool, now I have this exception in my emacs nrepl-messages

this is after I tried cljr-find-usages

NP: I'll switch over to Cursive for a minute

A beginners question : How can I start a loop with a start and end and a empty map ?

(loop [i 0 m {}] (if (= i 10) m (recur (inc i) (update m :foo inc)))))

but I hardly ever use loop

aha, now I see where I made my mistake

oke, for a exercise I need to re-implement range

and I thought loop could do that job

you could use it, it's always good to exercise

yep, the only way to get more and more familair with clojure

only reading about it do not work

@roelof: there is also a beginners channel btw, if that's helpful to you

@roelof: nm, I see you there now

I have been there almost the whole day the last 2 days no much help there

@borkdude: I think you got bitten by https://github.com/clojure-emacs/refactor-nrepl/issues/127

most likely you have two nses with the same name (on of them clj other one cljs) which tools.namespace can’t handle right now

in ur code or in one your dependencies i mean

borkdude : thanks, this did the job https://www.refheap.com/112143

as magnars reported it with quiescent

@roelof: great

@borkdude: many thanks from a cold Netherlands

@roelof: I'm in the same country 😉

oke, did not know that

can emacs highlight unused symbols for me like this? http://twitter.com/borkdude/status/670267589264695296

from which part are you, Im from Twente

@roelof: let's chat in private

@borkdude: I don’t think it can at the moment but sounds like a low hanging fruit actually. most likely can be done in clj-refactor as refactor-nrepl has find-used-locals

re https://github.com/clojure-emacs/refactor-nrepl/issues/127 more details: http://dev.clojure.org/jira/browse/TNS-38

@roelof: loop in Clojure is not an imperative loop. It’s the point at which recur will ‘jump’ to in a recursive call. It also binds the initial values used in the ‘loop’. Think of it like a ‘let’ that you loop back to on a recur call. I hope that makes sense?

yes, I had the way things work wrong into my head

I think I have seen to many different things when I was doing the clojure koans

You may need to look at 'for' which is a list comprehension. That's a fancy name for something that iteratively consumes a sequence assigning each element to a var. However, when I'm recursing over a sequence I usually use map if I'm just transforming each element in the sequence or reduce if I'm doing something that I need to maintain some state for during the recursion e.g. building a total.

@agile_geek: thanks. the challenge of 4 clojure which I tried to solve was re-implement range

and I thought recursion was a good candidate for a solution

Yep. Although there other ways as with all things!

there Always are different ways to solve this

@agile_geek: can you show me a other way

@roelof I'm just going out but I'll reply directly to you over the weekend

@agile_geek: no problem.

I can work on the other challenges of 4clojure or play with my toy project

@roelof: here's another way - (defn range' [start end step] (take-while #(< % end) (iterate #(+ % step) start)))

@mccraigmccraig nice! Very idiomatic

what's the best way to pull in a dependency that is only used in a test, that I also want to run from my 'lein repl' development

:scope test?

@mccraigmccraig: oke, I think I understand how it works, The only thing I need to check is iterate

@roelof: (iterate f x) returns an infinite lazy sequence with (x (f x) (f (f x)) ...) i.e. to get the next value in the sequence it applies f to the previous value

mccraigmccraig: thanks, I have found the same explanation in the clojure cheat-sheet

anyone here who has succeed in running datomic on clojure. Im following the getting started and ran into issues right away

Can someone leads me to documentation of ^{…}, I can’t figure it out what it is (I saw it in for)

metadata ? http://clojure.org/cheatsheet

http://clojure.org/metadata

awww you right !

didn’t think about cheatsheet, thanks

i just digging through this stuff myself

and searching google for ^{ is useless

I know, I tried 😄

so i ctrl+f the cheatsheet when im getting stuck

question: when unquote-splicing seqs, I don't need to worry about lazyness right?

on second thoughts, this seems like a stupid question, but I'd like to make sure