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clojurians | clojure | instead of `(to-array ...)`, I need `(into-array Pointer ...)` | 2017-12-20T16:28:15.000418 | Berry |
clojurians | clojure | right, you need into-array | 2017-12-20T16:41:33.000570 | Margaret |
clojurians | clojure | is `to-array` basically `(into-array Object ...)` ? | 2017-12-20T17:41:30.000427 | Berry |
clojurians | clojure | as I understand it yes | 2017-12-20T17:44:18.000389 | Margaret |
clojurians | clojure | except more efficient | 2017-12-20T17:47:12.000418 | Kareen |
clojurians | clojure | <@Berry> for questions like those I suggest just looking at the sources btw, it takes about 20 seconds and you'll learn much more | 2017-12-20T17:48:37.000295 | Kareen |
clojurians | clojure | g’day | 2017-12-20T18:56:48.000353 | Marcel |
clojurians | clojure | i also have a small question
using the thread-last macro, can I make an exception for one of the elements and insert the result as first argument? | 2017-12-20T19:02:21.000207 | Marcel |
clojurians | clojure | I tried to wrap it in a #(myfunc % params) but it doesn’t seem to work; neither does a fn :disappointed: | 2017-12-20T19:02:56.000191 | Marcel |
clojurians | clojure | I ended up writing an extra function outside of the thread | 2017-12-20T19:03:15.000169 | Marcel |
clojurians | clojure | hm, I guess I misunderstood thread macros; they take the functions as partials and appends an extra argument before actually calling the function? using other macros as functions might break the thread macros… | 2017-12-20T19:07:38.000253 | Marcel |
clojurians | clojure | maybe use the `as->` macro? | 2017-12-20T19:10:08.000113 | Thu |
clojurians | clojure | nah, looks weird :slightly_smiling_face: | 2017-12-20T19:10:21.000085 | Marcel |
clojurians | clojure | but is my assumption correct? (if someone understands my writing…) | 2017-12-20T19:10:44.000065 | Marcel |
clojurians | clojure | it doesn’t create partials | 2017-12-20T19:12:00.000056 | Jonas |
clojurians | clojure | it rewrites the code | 2017-12-20T19:12:05.000113 | Jonas |
clojurians | clojure | so you can use the anonymous functions, but it often requires extra parens | 2017-12-20T19:12:25.000043 | Jonas |
clojurians | clojure | yep | 2017-12-20T19:12:50.000302 | Marcel |
clojurians | clojure | ```(-> [1 2 3 4]
(->> (map #(+ 10 %))
(map str)
(clojure.string/join ","))
(clojure.string/replace #"," "."))``` | 2017-12-20T19:13:09.000119 | Jonas |
clojurians | clojure | pardon the terrible example | 2017-12-20T19:13:34.000182 | Jonas |
clojurians | clojure | hm, I didn’t mean “real” partials… but I think I understand now why it didn’t work | 2017-12-20T19:13:40.000006 | Marcel |
clojurians | clojure | you can “embed” thread last in a thread first | 2017-12-20T19:13:47.000046 | Jonas |
clojurians | clojure | but not the other way around | 2017-12-20T19:13:54.000102 | Jonas |
clojurians | clojure | you can also use the anonymous functions with extra parens | 2017-12-20T19:14:18.000241 | Jonas |
clojurians | clojure | ```(->> [1 2 3 4]
(map #(+ 10 %))
(map str)
(clojure.string/join ",")
(#(clojure.string/replace % #"," ".")))``` | 2017-12-20T19:14:40.000214 | Jonas |
clojurians | clojure | ah | 2017-12-20T19:14:54.000065 | Marcel |
clojurians | clojure | you can also use the `as->` macro | 2017-12-20T19:14:58.000212 | Jonas |
clojurians | clojure | woah, the extra parentheses did the trick :slightly_smiling_face: thanks | 2017-12-20T19:15:40.000137 | Marcel |
clojurians | clojure | i’ve also seen folks write ```(-> [1 2 3 4]
(->> (map #(+ 10 %)))
(->> (map str))
(->> (clojure.string/join ","))
(clojure.string/replace #"," "."))``` | 2017-12-20T19:15:52.000008 | Jonas |
clojurians | clojure | I think I finally started understanding clojure today :slightly_smiling_face: | 2017-12-20T19:16:08.000020 | Marcel |
clojurians | clojure | ```
(->> (apply concat (vals js))
(reduce reducer {})
(#(json/encode %1 {:pretty true}))
(spit "extract.json")))
``` | 2017-12-20T19:16:39.000244 | Marcel |
clojurians | clojure | i’m still not sure which form I prefer | 2017-12-20T19:16:39.000267 | Jonas |
clojurians | clojure | this works | 2017-12-20T19:16:49.000062 | Marcel |
clojurians | clojure | :thumbsup: | 2017-12-20T19:16:53.000185 | Jonas |
clojurians | clojure | another variant
```(-> [1 2 3 4]
(->> (map #(+ 10 %))
(map str)
(clojure.string/join ","))
(clojure.string/replace #"," "."))``` | 2017-12-20T19:21:25.000151 | Margaret |
clojurians | clojure | showing that it’s not partial application ```=> (-> [a 1 b 41] (let (+ a b)))
42``` | 2017-12-20T19:22:39.000312 | Margaret |
clojurians | clojure | it’d be neat if there was an `as->` and `as->>` that defaulted to thread-first or thread-last if no `$` was found | 2017-12-20T19:23:01.000032 | Thu |
clojurians | clojure | I'm really tripped up on this java interop issue:
I want it to call `remove(int index)` -- what would I have to do to typehint this correctly?
This is the class: <https://hc.apache.org/httpcomponents-client-ga/httpclient/apidocs/org/apache/http/impl/client/RedirectLocations.html>
I tried to create a function
```
(defn do-it [^org.apache.http.impl.client.RedirectLocations redirect-locations ^Integer index]
(.remove redirect-locations index))
``` | 2017-12-20T19:24:49.000281 | Danielle |
clojurians | clojure | for some methods you might need to call `int` to cast the arg, recall that in clojure `1` is not an Integer, it’s a Long | 2017-12-20T19:26:32.000147 | Margaret |
clojurians | clojure | right, so i'd wrap `index` with `(int index)` -- I tried that, still doesn't work | 2017-12-20T19:28:42.000096 | Danielle |
clojurians | clojure | what error are you getting? | 2017-12-20T19:28:51.000024 | Margaret |
clojurians | clojure | <@Margaret> just tried to understand your example from above… it wouldn’t work with `(->> X (-> Y) Z)` right? | 2017-12-20T19:29:03.000043 | Marcel |
clojurians | clojure | <@Marcel> correct - all the other arrow macros nest inside ->, but -> can’t nest inside ->> | 2017-12-20T19:29:31.000155 | Margaret |
clojurians | clojure | it has to do with the mechanics of the code rewrite (the silly example with the let is to show that it isn’t smart at all - it’s just moving tokens around in lists) | 2017-12-20T19:30:16.000327 | Margaret |
clojurians | clojure | i see :upside_down_face: | 2017-12-20T19:30:16.000336 | Marcel |
clojurians | clojure | <@Margaret> I'm not getting an error, but it's returning a boolean false which is coming from the other method signature. boolean remove(URI uri) | 2017-12-20T19:30:20.000095 | Danielle |
clojurians | clojure | <@Danielle> ahh - what if you hint ^int instead of ^Integer? | 2017-12-20T19:30:57.000152 | Margaret |
clojurians | clojure | (I bet I have a project with this dep, I’ll see if I can replicate in a repl) | 2017-12-20T19:31:31.000034 | Margaret |
clojurians | clojure | how do i typehint with `^int`, i get `Unmatched delimiter: )` | 2017-12-20T19:32:37.000020 | Danielle |
clojurians | clojure | don't do that, do `(.remove redirect-locations (int index))` | 2017-12-20T19:33:40.000181 | Rebeca |
clojurians | clojure | err | 2017-12-20T19:33:45.000094 | Rebeca |
clojurians | clojure | (without the extra i) | 2017-12-20T19:34:02.000186 | Rebeca |
clojurians | clojure | ```kingfisher.core=> (defn rm [^RedirectLocations r ^long idx] (.remove r idx))
#'kingfisher.core/rm
kingfisher.core=> (rm red 0)
#object[java.net.URI 0x2a3988c0 "<http://google.com>"]``` | 2017-12-20T19:34:16.000201 | Margaret |
clojurians | clojure | interesting that you typehinted a long | 2017-12-20T19:35:02.000236 | Danielle |
clojurians | clojure | `(set! *warn-on-reflection* true)` will tell you if the compiler is emitting reflection | 2017-12-20T19:35:10.000240 | Rebeca |
clojurians | clojure | int primitives are not supported by the clojure compiler | 2017-12-20T19:35:23.000196 | Margaret |
clojurians | clojure | so I made it a long, and it worked | 2017-12-20T19:35:31.000023 | Margaret |
clojurians | clojure | or just call `int` | 2017-12-20T19:35:46.000196 | Rebeca |
clojurians | clojure | <@Rebeca> it was still calling the wrong method when I called int | 2017-12-20T19:35:59.000272 | Margaret |
clojurians | clojure | I doubt | 2017-12-20T19:36:41.000130 | Rebeca |
clojurians | clojure | ```kingfisher.core=> (defn rm2 [r idx] (.remove r (int idx)))
#'kingfisher.core/rm2
kingfisher.core=> (.add red 0 (java.net.URI. "<http://google.com>"))
nil
kingfisher.core=> (rm2 red 0)
false``` | 2017-12-20T19:37:00.000076 | Margaret |
clojurians | clojure | boolean is what the Object overload returns if it gets hit | 2017-12-20T19:37:23.000194 | Margaret |
clojurians | clojure | you aren't hinting r | 2017-12-20T19:37:53.000343 | Rebeca |
clojurians | clojure | i tried using `(int x)` instead of the typehint and it worked as well | 2017-12-20T19:37:56.000162 | Danielle |
clojurians | clojure | you need to do both | 2017-12-20T19:37:59.000088 | Rebeca |
clojurians | clojure | <@Rebeca> ahh, OK | 2017-12-20T19:38:05.000049 | Margaret |
clojurians | clojure | it appeared typehinting `r` was the thing i missed | 2017-12-20T19:38:05.000189 | Danielle |
clojurians | clojure | turning on reflection warnings will make it clear when you have eliminated the reflection or not | 2017-12-20T19:38:56.000014 | Rebeca |
clojurians | clojure | the long hint also causes the function to implement the primitive invoke stuff(if I recall), which is orthogonal to compiling an invoke of the right method | 2017-12-20T19:40:57.000261 | Rebeca |
clojurians | clojure | thank you gents -- i need to practice up my interop & reflection fu | 2017-12-20T19:41:16.000185 | Danielle |
clojurians | clojure | something that’s helpful sometimes is a leiningen plugin called no.disassemble - it can expose what your function compiles down to as readable mnemonics for the byte code <https://github.com/gtrak/no.disassemble> | 2017-12-20T19:44:36.000346 | Margaret |
clojurians | clojure | Upgrading to clj 1.9. Anyone else getting these error messages?
```WARNING: boolean? already refers to: #'clojure.core/boolean? in namespace: clojure.tools.analyzer.utils, being replaced by: #'clojure.tools.analyzer.utils/boolean?
WARNING: boolean? already refers to: #'clojure.core/boolean? in namespace: clojure.tools.analyzer, being replaced by: #'clojure.tools.analyzer.utils/boolean?
WARNING: bounded-count already refers to: #'clojure.core/bounded-count in namespace: clojure.core.async, being replaced by: #'clojure.core.async/bounded-count``` ? | 2017-12-20T20:10:44.000003 | Malissa |
clojurians | clojure | have you upgrade core.async recently? | 2017-12-20T20:18:37.000040 | Rebeca |
clojurians | clojure | are you using require :all or use? | 2017-12-20T20:19:43.000193 | Rebeca |
clojurians | clojure | my guess would be you have an older version of core.async that doesn't exclude bounded-count from clojure.core | 2017-12-20T20:21:41.000290 | Rebeca |
clojurians | clojure | <@Rebeca> I have upgraded core.async, currently running on `[org.clojure/core.async "0.3.465"]` | 2017-12-20T20:48:32.000183 | Malissa |
clojurians | clojure | This is the ns def in the file in question:
```(:require [clojure.test :refer :all]
[amazonica.core :refer [defcredential]]
;; our stuff
[com.stuartsierra.component :as component]
[clojure.core.async :as async :refer [go go-loop >! <! timeout alts! alts!!]])``` | 2017-12-20T20:49:44.000291 | Malissa |
clojurians | clojure | It is having issues on my call to `go-loop` but I'm not quite so sure why | 2017-12-20T20:50:30.000089 | Malissa |
clojurians | clojure | It appears I just needed to run lein clean :confused: | 2017-12-20T20:58:37.000160 | Malissa |
clojurians | clojure | Appreciate the time and thoguht <@Rebeca> | 2017-12-20T21:08:42.000013 | Malissa |
clojurians | clojure | <@Kareen>: yeah, I can definitely do a bit more clojure source reading. How do you find the source? checking out clojure + grep, or the github interface, or repl/source, or ... ? | 2017-12-20T21:35:00.000006 | Berry |
clojurians | clojure | open your favourite IDE, type a method, click on “go to source” or similar | 2017-12-20T21:51:45.000073 | Marcel |
clojurians | clojure | or use REPL with `(source SOME-COMMAND)`, but it’s not really useful to “browse” | 2017-12-20T21:52:33.000152 | Marcel |
clojurians | clojure | eek | 2017-12-21T00:49:30.000083 | Marcel |
clojurians | clojure | <@Sandy>: re parsing / ometa : I figured out what I was looking for -- parsec | 2017-12-21T02:38:28.000002 | Berry |
clojurians | clojure | Hello all, I'm developing a reporting generator but in Java/Clojure I do not have the right library for the charting session. The charting library is in javascript, so, is there possible to generate the charts from javascript/html and use it in Clojure as svg or image without having server/browser generating it? | 2017-12-21T03:41:29.000133 | Lois |
clojurians | clojure | <@Lois> you have the option of using nodejs or rhino to run JS without a browser | 2017-12-21T04:26:45.000278 | Jami |
clojurians | clojure | how cheap/expensive is `(fn [] ...)` is it as cheap as a function call, or is creating anonyous functions at runtime realy expensive ? | 2017-12-21T04:45:46.000255 | Berry |
clojurians | clojure | it is as cheap as an object creation can be | 2017-12-21T04:51:44.000335 | Rosia |
clojurians | clojure | naively it seems for a `(fn [] ...)` there is some compilation / byte code generation to be done, which might make it expensive | 2017-12-21T04:57:45.000122 | Berry |
clojurians | clojure | does clojure somehow do all this pre-emptively and cache it (despite not having the environment until runtime) | 2017-12-21T04:58:01.000263 | Berry |
clojurians | clojure | each function generates a class at compile time | 2017-12-21T04:58:45.000219 | Rosia |
clojurians | clojure | then it is lazily loaded by the classloader as with java | 2017-12-21T04:59:43.000076 | Rosia |
clojurians | clojure | this is a drastic oversimplification, so you're saying:
1. at compile time, each `(fn [...] ...)` has a class generated for it
2. at runtime, when to exec the code, the corresponding code is passsed the env as an argument, creating a "clojure function object"
3. this "function object" can then be used just like any other clojure functions, and passed arguments to make it work ? | 2017-12-21T05:01:15.000195 | Berry |
clojurians | clojure | yes | 2017-12-21T05:03:34.000071 | Rosia |
clojurians | clojure | thanks; this explains so much! | 2017-12-21T05:06:10.000002 | Berry |
clojurians | clojure | I learned a lot about the compiler by decompiling my clojure code | 2017-12-21T05:07:48.000279 | Rosia |
clojurians | clojure | I tried that once, but the decompiler lib crashed the JVM, and I never tried it again. | 2017-12-21T05:15:27.000123 | Berry |
clojurians | clojure | Where is the linux installer versioned? (If at all) | 2017-12-21T06:54:03.000192 | Jodie |
clojurians | clojure | (For the clj command line tool) | 2017-12-21T06:55:26.000048 | Jodie |
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