@hiredman, i’m using tufte, and just adding p tags around different components of the function

for example, if i have (defn recursive-kindof [] (p :thing (do-a-thing)) (p :recur (recursive-kindof))), :recur will seem to take the most time

Because you have a loop and are suming the runtimes of each iteration of the loop geometrically (I think that is right term)

So imagine the last iteration of your loop runs, takes N seconds, returns t

To the previous iteration, and N is added to :recurs runtime

The previous iteration returns, it's runtime 2N is added to recurs runtime (3N), and so on adding 3N to become 6N, then 4N to become 10N as the call stack unwinds

I mean, that is my guess as to why a naive profiler would end up amplifying the reported runtime of recursive calls

Arithmetic, not geometric

No, arithmetic isn't right either, it is Fibonacci like

I'm confused how type casting works in clojure with abstractions. Is there a lightweight pointer type conversion that happens to achieve polymorphism similar to OOP languages. Or when upcasting happens, does it transform the object itself? Consider (= (list 1 2 3) [1 2 3]) which evaluates to true. I think here the list and the vector are both upcasted to a collection. How does that upcasting work?

it doesn't do that, = eventually calls the equiv method on either the list or the vector, which both say "if the thing you comparing is a java.util.List or a clojure.lang.Sequential then compare it by taking the seq of it and comparing that"

where a seq is a functional (immutable persistent) iterator kind of thing

trying to think about things in statically typed oop terms with casting is just going to confuse you a lot with clojure

A lot of the Java code in the implementation of clojure is pretty atypical Java and can be thought of as clojure transliterated in Java, lots of methods that just take Object which is the type at the top of the jvms class hierarchy, which makes any casting down casting

is there any library that supports messaging (publish/subscription) (just like what rabbitmq does, but as a library instead of a standalone process)

I would like it if I could declare a defmethod as a simple reference to a function having to write

(defmethod example-multi :ex 
  [& args]
  (apply my-ex-handler args))

(defmethod example-multi :ex my-ex-handler)

(defmethod example-multi :ex #'my-ex-handler)

has anyone ever tried to target Python as compilation target for Clojure? (like a clojurescript but for the python runtime)

yes there were a few (2 I can recall at least) but both are abandonware.

Hi all, I have a newbie question. I want to play with ClojureScript analyze and emit from a Clojure project. How I import this code in a regular Clojure project?

Hello, any idea why do I get LispReader$ReaderException: java.lang.RuntimeException: Invalid token: ::kd/sid when trying to use a namespaced key with an alias? The full session:

$ repl.sh
nREPL 0.6.0
Clojure 1.10.1
OpenJDK 64-Bit Server VM 1.8.0_222-b10
user=> (require '[app.domain :as kd])
nil
user=> kd/CATEGORIES ; the ns is required and I can access stuff in it using the kd/... form
#{:additional-services :all-usage}
user=> {::kd/sid 123} ; ... but not in keys?!
Caused by: clojure.lang.LispReader$ReaderException: java.lang.RuntimeException: Invalid token: ::kd/sid

user=> (alias 'u 'user)
user=> ::u/k ; => RuntimeException: Invalid token: ::u/k

$ clj
Clojure 1.10.1
user=> (alias 'u 'user)
nil
user=> ::u/k
:user/k

Caused by: clojure.lang.LispReader$ReaderException: java.lang.RuntimeException: Invalid token: ::u2/k
	at clojure.lang.LispReader.read(LispReader.java:314)
	at clojure.lang.LispReader.read(LispReader.java:216)
	at clojure.lang.LispReader.read(LispReader.java:210)
	at clojure.core$read.invokeStatic(core.clj:3766)
	at clojure.core$read.invokeStatic(core.clj:3741)
	at clojure.core$read.invoke(core.clj:3741)
	at nrepl.cmdline$run_repl.invokeStatic(cmdline.clj:103)
	at nrepl.cmdline$run_repl.invoke(cmdline.clj:85)
	at clojure.lang.Var.invoke(Var.java:393)
	at nrepl.cmdline$interactive_repl.invokeStatic(cmdline.clj:358)
	...
Caused by: java.lang.RuntimeException: Invalid token: ::u2/k
	at clojure.lang.Util.runtimeException(Util.java:221)
	at clojure.lang.LispReader.interpretToken(LispReader.java:412)
	at clojure.lang.LispReader.read(LispReader.java:305)
	at clojure.lang.LispReader.read(LispReader.java:220)
	at clojure.lang.LispReader.access$200(LispReader.java:41)
	at clojure.lang.LispReader$WrappingReader.invoke(LispReader.java:771)
	at clojure.lang.LispReader.read(LispReader.java:285)
	at clojure.lang.LispReader.readDelimitedList(LispReader.java:1398)
	at clojure.lang.LispReader$ListReader.invoke(LispReader.java:1243)
	at clojure.lang.LispReader.read(LispReader.java:285)

what is repl.sh? how does it do read?

In clojure.spec (the first version), is it possible to register(?) a generator for a custom predicate that is just a plain function. Like, such that, (s/gen my-predicate?) gives me a generator in much the same way as (s/gen int?) would.

Does anyone else prefer the interceptor over middleware pattern for purely aesthetic reasons? I understand that most things (ie pedestal) implementing interceptors do so for other reasons as well, such as easier error/async handling. I have worked with both a little bit on and off for years. But with middleware I find myself having to pause and mentally work out how to order my middleware, and frequently make dumb bugs like forgetting to call a handler, etc. Is this just me? Does it get better with more experience/extensive use of middleware? Would anyone else choose to use interceptors in a library even when a middleware pattern would suffice?

Hi, Is there a algorithm to compress a string to a string? I have some names like demo_combinator-demo__red-child. I want to make it shorter, but still unique. is it possible?

the transit lib caches keywords so they can be represented by a short token - or is the goal to end up with something human readable?

they don't need to be human readable. but I will use this in macro, I want a unique name by compressing a qualified symbol, so I think cache is not good for my case.

it's not a stored cache - it's only per unit of encoding for transit, sounds like it isn't the kind of thing you want anyway

yes, thanks anyway.

I guess I have an idea, just got one