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clojurians | clojure | oh, I see that now | 2017-11-09T17:37:40.000489 | Margaret |
clojurians | clojure | I was trying to show some other examples that were incremental improvements upon his original | 2017-11-09T17:37:50.000173 | Jonas |
clojurians | clojure | another suggestion: `(assoc 0 second-letter 1 first-letter)` - assoc is vararg | 2017-11-09T17:38:26.000245 | Margaret |
clojurians | clojure | clojure is fun because you can often come up with a really concise readable version | 2017-11-09T17:39:16.000114 | Jonas |
clojurians | clojure | `(let [[first-letter second-letter :as l] (vec w)] ... )` would do what you need I think? (edited to use `vec` instead of `seq` so `l` is a vector) | 2017-11-09T17:39:16.000121 | Daniell |
clojurians | clojure | you don't need seq there | 2017-11-09T17:39:29.000400 | Margaret |
clojurians | clojure | but as he said, he showed that above | 2017-11-09T17:39:48.000242 | Margaret |
clojurians | clojure | Oh, I didn't scroll back to see -- it's a _very_ long thread :wink: | 2017-11-09T17:40:17.000143 | Daniell |
clojurians | clojure | I think the main take aways are 1) name intermediate variables in a way that helps convey what you’re trying to do if possible 2) if possible try to write a solution that matches a declarative description of the problem. I think the other changes are less important. | 2017-11-09T17:43:05.000384 | Jonas |
clojurians | clojure | ```(->> ["hello" "world"]
(mapv #(let [[first-letter second-letter :as word] (vec %)]
(clojure.string/join (assoc word 0 second-letter 1 first-letter)))))``` | 2017-11-09T17:43:43.000543 | Daniell |
clojurians | clojure | (TIL recently: `str/join` uses `""` if you omit the separator) | 2017-11-09T17:44:04.000216 | Daniell |
clojurians | clojure | `assoc`ing into a vector kinda bothers me... I think I'd do `(into [second-letter first-letter] (nnext word))` (and then you don't need the call to `vec`). | 2017-11-09T17:51:58.000056 | Daniell |
clojurians | clojure | <@Daniell> first time I see this « let in map destructuring » coding style... pretty cool | 2017-11-09T18:21:41.000427 | Ernesto |
clojurians | clojure | <https://www.reddit.com/r/Clojure/comments/7btc2k/who_owns_the_twitter_accounts_clojure/> | 2017-11-09T22:04:22.000159 | Aletha |
clojurians | clojure | is there an example of clojure.spec-ing either SVG or HTML so if my 'hiccup data' passes the spec, it's valid HTML/SVG ? | 2017-11-09T22:39:28.000013 | Berry |
clojurians | clojure | in standard usage of spec, when ::foo shows up in different maps (of the same namespace), is it expected that the value associated with ::foo will always be of the same 'shape' ? | 2017-11-10T02:54:37.000221 | Berry |
clojurians | clojure | in spec the mapping of a qualified keyword to a spec (shape) is global by design, so yes. | 2017-11-10T04:09:22.000311 | Karolyn |
clojurians | clojure | though you can make the spec match a set of pretty much arbitrary shapes if you’re set on doing that. | 2017-11-10T04:10:12.000151 | Karolyn |
clojurians | clojure | qqq: Well the value of ::foo must match whatever the spec behind ::foo says. You can use `spec/or` or similar for disjunction. | 2017-11-10T04:14:31.000136 | Basil |
clojurians | clojure | qqq: as for a hiccup "spec", I used <http://p.tarn-vedra.de/hiccup-spec.html> in the past. This also has the benefit of conforming to a nice tree that can be converted to html by a simple tree-walk. Note that `:tag` is just `keyword?`, you can extend htis and `:attrs` with better specs describing the set of allowed tags / attributes. | 2017-11-10T04:15:52.000360 | Basil |
clojurians | clojure | Question about type hinting: I have code like: `(def ms-per-second 1000) (def ms-per-minute (* ms-per-second 60))` - I get a boxed math warning w/ that second def unless I use `(def ms-per-minute (* ^long ms-per-second 60))`. I'd like to type hint `ms-per-second` once where it's defined to avoid needing to type hint it everywhere it's used. Is that possible? | 2017-11-10T09:28:45.000030 | Deana |
clojurians | clojure | yes | 2017-11-10T09:30:12.000335 | Kareen |
clojurians | clojure | however if you want to avoid boxing, you should probably use `^:const` too | 2017-11-10T09:30:52.000683 | Kareen |
clojurians | clojure | Could you please show me what that syntax looks like? I haven't been able to get any placement of the ^long hint to work. I get this error: java.lang.IllegalArgumentException: Unable to resolve classname: clojure.core$long@5aadb195 | 2017-11-10T09:31:51.000263 | Deana |
clojurians | clojure | in pseudo syntax, what's happening is w/o type hint: `Numbers.multiply (Long(60), (Long)ms-per-second.get())`, w/ type hint: `Numbers.multiply((long) 60, ms-per-second.get().longValue())`, w/ const `Numbers.multiply((long) 60, (long) 1000))` | 2017-11-10T09:33:35.000378 | Kareen |
clojurians | clojure | yeah sure | 2017-11-10T09:33:37.000135 | Kareen |
clojurians | clojure | just `(def ^{:const true :tag 'long} ms-per-second 1000)` | 2017-11-10T09:33:52.000292 | Kareen |
clojurians | clojure | or `(def ^:const ^long ms-per-second 1000)` | 2017-11-10T09:34:09.000045 | Kareen |
clojurians | clojure | the long tag is actually useless with const as the compiler will be able to infer it after inlining | 2017-11-10T09:34:32.000072 | Kareen |
clojurians | clojure | Thank you very much | 2017-11-10T09:35:02.000054 | Deana |
clojurians | clojure | <@Mallory> that use case is very easy to handle with specter: `(transform [ALL (srange 0 2)] clojure.string/reverse ["hello" "world"])` | 2017-11-10T09:48:12.000195 | Owen |
clojurians | clojure | a great example of using composition to avoid having to reinvent the wheel (in this case, string reversal) | 2017-11-10T09:51:30.000138 | Owen |
clojurians | clojure | can you type hint the return of a protocol function signature? | 2017-11-10T10:14:59.000243 | Magdalena |
clojurians | clojure | or do you have to do it at the call site? | 2017-11-10T10:15:17.000447 | Magdalena |
clojurians | clojure | sure | 2017-11-10T10:21:01.000138 | Kareen |
clojurians | clojure | `(defprotocol P (f ^MyType [..]))` | 2017-11-10T10:21:56.000424 | Kareen |
clojurians | clojure | don’t know why I didn’t just try it lol | 2017-11-10T10:25:29.000602 | Magdalena |
clojurians | clojure | Is there a proper channel for asking 1.9 questions? <#C1B1BB2Q3|clojure-spec> ? | 2017-11-10T10:44:11.000264 | Pauletta |
clojurians | clojure | is there anything special about `unq in
```
(s/def :unq/person
(s/keys :req-un [::first-name ::last-name ::email]
:opt-un [::phone]))
```
or is this literally the `:person` keyword in the `unq` namespace ? | 2017-11-10T10:48:45.000551 | Berry |
clojurians | clojure | `:unq` is the namespace part of the `:unq/person` keyword | 2017-11-10T10:58:56.000483 | Shamika |
clojurians | clojure | there’s nothing really _special_ about it, it could be anything | 2017-11-10T10:59:26.000565 | Shamika |
clojurians | clojure | hey all. I need to set an Object’s field but I don’t know it’s name until runtime. | 2017-11-10T11:18:22.000021 | Timmy |
clojurians | clojure | I’d like to do do: `(set! (.-field object) value)` but I have .-field as a String. | 2017-11-10T11:19:21.000044 | Timmy |
clojurians | clojure | Thanks for this, I was actually including monitor.utils and still had problems. It turns out that it was because I was using CIDER’s refresh functionality (C-c C-x in emacs) instead of `clojure.tools.namespace.repl/refresh`! Still unsure as to why, but at least I found a way around it | 2017-11-10T11:19:40.000268 | Ted |
clojurians | clojure | <@Berry> the single `:` syntax doesn’t presuppose any loading, so there’s no guarantee that unq maps to a namespace at all. `::` will implicitly be a real namespace, as it will either be the current namespace or `::alias/foo` where `alias` will have to have been `require` `:as`’d. | 2017-11-10T11:32:52.000683 | Magdalena |
clojurians | clojure | <https://docs.oracle.com/javase/tutorial/reflect/> | 2017-11-10T11:59:52.000322 | Rebeca |
clojurians | clojure | Anyone know of a way to use ring or bidi to create a url with certain query params from a map?
Doing string concatenation feels wrong in this case. I'm trying to general an oauth redirect link. | 2017-11-10T12:13:47.000351 | Earlie |
clojurians | clojure | if they're about spec ask there, otherwise here is fine | 2017-11-10T12:24:37.000527 | Kareen |
clojurians | clojure | Thanks <@Rebeca> I was beginning to suspect I’d need to fall back on Java’s reflection. | 2017-11-10T12:27:54.000495 | Timmy |
clojurians | clojure | definitely with bidi you should be using one of its built in functions for doing that | 2017-11-10T12:28:09.000089 | Rebeca |
clojurians | clojure | path-for | 2017-11-10T12:28:53.000198 | Rebeca |
clojurians | clojure | Is there a recommended way to use protobuf with clojure? The first few projects that come up after a google search don't seem to be actively maintained. I'm specifically looking for something that plays nice with repl dev | 2017-11-10T12:43:27.000187 | Demarcus |
clojurians | clojure | <@Magdalena> <@Shamika>: makes sense; thanks! | 2017-11-10T14:32:13.000106 | Berry |
clojurians | clojure | ```
(s/def :event/type keyword?)
(s/def :event/timestamp int?)
(s/def :search/url string?)
(s/def :error/message string?)
(s/def :error/code int?)
(defmulti event-type :event/type)
(defmethod event-type :event/search [_]
(s/keys :req [:event/type :event/timestamp :search/url]))
(defmethod event-type :event/error [_]
(s/keys :req [:event/type :event/timestamp :error/message :error/code]))
(s/def :event/event (s/multi-spec event-type :event/type))
(s/explain :event/event
{:event/type :event/search
:event/timestamp 123456789
:search/url "<https://clojure.org>"})
```
can someone please explain to me why this is failing?
I don't understand the error of:
`val: {:event/type :event/search, :event/timestamp 123456789, :search/url "<https://clojure.org>"} fails spec: :event/event at: [nil] predicate: event-type, no method` | 2017-11-10T14:37:59.000462 | Berry |
clojurians | clojure | ah, it works now: the above code works fine; problem was, I initially defined the defmulti wrong, and then upon correction, it was not being redefined until I called a remove-ns | 2017-11-10T14:42:25.000055 | Berry |
clojurians | clojure | you should join the <#C1B1BB2Q3|clojure-spec> channel too | 2017-11-10T14:57:18.000290 | Shamika |
clojurians | clojure | So in working on an application which interacts with PSQL, I’ve setup some standard tooling which pulls dates out of the records and transforms them from sql times to jodatimes (because `clj-time` has this functionality).
However, in working with 1.9, the `inst?` operator expects a `java.util.date`. I’m curious if there’s been any public conversation around what timestamps clj should be using going forward, especially now considering there’s `java.time` in jdk 8, etc. | 2017-11-10T15:01:06.000430 | Pauletta |
clojurians | clojure | <@Pauletta> `inst?` works just fine for `java.time.Instant` | 2017-11-10T15:03:24.000185 | Randee |
clojurians | clojure | <@Pauletta> I think at this point I would switch to Java Time. I'm one of the maintainers of `clj-time` and we've been wrestling for a long time with the question of whether to migrate/produce a new version of `clj-time` on top of Java Time. The feeling is that we can't realistically do it in a compatible way and therefore we'd need a new artifact name (rather than change the API and/or semantics and violate the spirit of Rich's Spec-ulation talk) -- so it would be a "new" library altogether (similar to `clj-time`). But none of us have the time(!) or inclination for that, so I'm switching to `clojure.java-time` which is based on Java Time and that's what I'm recommending folks use. | 2017-11-10T15:15:19.000040 | Daniell |
clojurians | clojure | I've introduced `clojure.java-time` at work and we're slowly migrating off our current combination of `date-clj` (for `java.util.Date` stuff) and `clj-time` (for Joda Time stuff). | 2017-11-10T15:16:24.000038 | Daniell |
clojurians | clojure | hello world | 2017-11-10T15:19:16.000274 | Kathe |
clojurians | clojure | i'm trying to use `spyscope` from <https://github.com/dgrnbrg/spyscope>. Added the dependency to my `project.clj` but when I try and add `[require [spyscope.core as spy]` in my namespace, repl refuses to start. The error is:
```
Exception in thread "main" clojure.lang.ExceptionInfo: Call to clojure.core/ns did not conform to spec:
In: [2] val: ((require [clojure.pprint :as pp] [clojure.string :as str] [clj-time.core :as time] [clj-time.format :as fmt])) fails spec: :clojure.core.specs.alpha/ns-form at: [:args] predicate: (cat :attr-map (? map?) :clauses :clojure.core.specs.alpha/ns-clauses), Extra input
#:clojure.spec.alpha{:problems [{:path [:args], :reason "Extra input", :pred (clojure.spec.alpha/cat :attr-map (clojure.spec.alpha/? clojure.core/map?) :clauses :clojure.core.specs.alpha/ns-clauses), :val ((require [clojure.pprint :as pp] [clojure.string :as str] [clj-time.core :as time] [clj-time.format :as fmt])), :via [:clojure.core.specs.alpha/ns-form], :in [2]}], :spec #object[clojure.spec.alpha$regex_spec_impl$reify__2436 0x3c7c886c "clojure.spec.alpha$regex_spec_impl$reify__2436@3c7c886c"], :value (spyscope.core "This co" (require [clojure.pprint :as pp] [clojure.string :as str] [clj-time.core :as time] [clj-time.format :as fmt])), :args (spyscope.core "This co" (require [clojure.pprint :as pp] [clojure.string :as str] [clj-time.core :as time] [clj-time.format :as fmt]))}, compiling:(spyscope/core.clj:1:1)
```
any clues? (oh, and I'm using clojure 1.9.0-RC1) | 2017-11-10T15:20:55.000095 | Kathe |
clojurians | clojure | <@Kathe> Which version of spyscope did you use? | 2017-11-10T15:32:40.000107 | Daniell |
clojurians | clojure | 0.1.6 is the latest. | 2017-11-10T15:33:11.000404 | Daniell |
clojurians | clojure | Looks like 0.1.6 includes the fix for the issue you saw above -- I see commits fixing the `ns` forms. | 2017-11-10T15:33:39.000567 | Daniell |
clojurians | clojure | Although it looks like you may run into this <https://github.com/dgrnbrg/spyscope/issues/26> until the maintainer releases 0.1.7. | 2017-11-10T15:35:39.000189 | Daniell |
clojurians | clojure | Good point. My above question was from a standpoint of what should I expect to be using in 6 months, etc.
Thanks for pointing this out! | 2017-11-10T15:38:41.000245 | Pauletta |
clojurians | clojure | This is great information. Thanks Sean. The debates we’ve had at work have been mostly the same, but having some indication from the maintainer of clj-time itself definitely helps. | 2017-11-10T15:39:58.000372 | Pauletta |
clojurians | clojure | (that starts out as the bug you encountered <@Kathe> but notes there's a 0.1.6 release but that also has a blocking bug and the library needs a 0.1.7 release made, since the fix is already merged) | 2017-11-10T15:41:32.000036 | Daniell |
clojurians | clojure | `clj-time` will continue to be maintained, but it's much less useful now we have Java Time. I've been very happy with `clojure.java-time` so far in production code. | 2017-11-10T15:43:09.000264 | Daniell |
clojurians | clojure | Hi; I’d like to experiment with program obfuscation and one part I’d like to do via term rewriting — does anyone have a favorite term rewriting library? It seems expresso and stratege and termito are the common ones; expresso seems to be focused on symbolic mathematical expressions, but I don’t think that really matters | 2017-11-10T18:12:15.000175 | Georgianne |
clojurians | clojure | <@Daniell> i downgraded clojure to 1.8.0 and spyscope to 0.1.5. all is well with the world (since i'm not really using spec yet). once i'm done debugging i'll remove spyscope and revert to 1.9.0-RC1. thank you so much! | 2017-11-10T20:49:31.000016 | Kathe |
clojurians | clojure | is there any way to add log or println statements _inside_ a threading macro? looks like it tries to pass the result (`nil`) to the next step. I'd like for the log/print statements to just print the message but otherwise be ignored. | 2017-11-11T00:21:02.000036 | Kathe |
clojurians | clojure | `(-> stuff (doto (println)) more-stuff)` <@Kathe> | 2017-11-11T00:30:48.000038 | Daniell |
clojurians | clojure | <@Kathe> taoensso.timbre/spy can do that for you: `(-> stuff spy more-stuff)` if you're already using timbre | 2017-11-11T00:32:04.000015 | Ava |
clojurians | clojure | (but timbre drags in half the world so unless you're already using it, perhaps a sledgehammer to crack a nut?) | 2017-11-11T00:32:38.000054 | Daniell |
clojurians | clojure | _and I say that as someone who uses timbre in production_ | 2017-11-11T00:32:51.000040 | Daniell |
clojurians | clojure | yeah, me too. timbre is .... blunt. but I've found it to be slightly more sane the everything else. | 2017-11-11T00:33:36.000011 | Ava |
clojurians | clojure | and if you don't have timbre, `(def spy #(do (prn %) %))` gets you most of the way there | 2017-11-11T00:34:36.000001 | Ava |
clojurians | clojure | <@Ava> The big plus of timbre for me is that with plugins it can hijack *all* logging and filter it through _one_ place. Otherwise, it's really a pain in the butt. | 2017-11-11T00:34:48.000002 | Daniell |
clojurians | clojure | that's exactly my use case. it took me a bit of time to configure correctly, but I can manage all of my logging in the JVM world via timbre and even configure it at runtime easily | 2017-11-11T00:35:28.000001 | Ava |
clojurians | clojure | We were using bare `tools.logging` at first and that was super fragile, with log4j, so we backed off to just `println` for a while, and then switched to timbre, and we're still not happy. | 2017-11-11T00:35:41.000065 | Daniell |
clojurians | clojure | It's like logging is just a horrible problem and timbre is the least bad of many solutions? | 2017-11-11T00:36:11.000059 | Daniell |
clojurians | clojure | <@Daniell>, <@Ava>: thank you for the suggestions. i'll look into timbre (it seems.. a lot) | 2017-11-11T00:48:05.000015 | Kathe |
clojurians | clojure | for now, i tried the `doto`, `prn`, and `spy` suggestions but none seem to work. here's a minimal example:
```
(defn foo0 [x]
(->> x
(* 2)))
(defn foo1 [x]
(->> x
(doto (println))
(* 2)))
(defn foo2 [x]
(->> x
(spy "doing the thing with the thing")
(* 2)))
``` | 2017-11-11T00:48:46.000011 | Kathe |
clojurians | clojure | the function call immediately after the log statement fails with either a cast or arity error. | 2017-11-11T00:50:19.000032 | Kathe |
clojurians | clojure | <@Kathe> I wrote tiny library for this <https://github.com/madstap/hugin> | 2017-11-11T02:03:36.000025 | Giovanna |
clojurians | clojure | It's for exploring at the repl and not a logging library though | 2017-11-11T02:04:10.000001 | Giovanna |
clojurians | clojure | ```
(require '[hugin.dbg :as dbg])
(defn foo [x]
(->> x
(dbg/p< "Doing the thing with the thing")
(* 2)))
```
should work. | 2017-11-11T02:06:26.000063 | Giovanna |
clojurians | clojure | Use `->` not `->>` | 2017-11-11T02:36:47.000014 | Daniell |
clojurians | clojure | `->>` inserts the expression at the _end_ of the form. You want the expression inserted as the _first_ argument, not the last. | 2017-11-11T02:37:59.000022 | Daniell |
clojurians | clojure | hmm, dissoc does not work on vectors. what's the simplest way to remove an element from a vector (by index)? | 2017-11-11T08:50:39.000102 | Chang |
clojurians | clojure | <@Chang> this works: <https://stackoverflow.com/a/18319708/4839573> | 2017-11-11T09:26:21.000033 | Adele |
clojurians | clojure | Just for fun: Writing ansible config in CLJ: <https://gist.github.com/rauhs/a72cfbeef4c80f9a58480484c49e7a51> | 2017-11-11T09:49:55.000091 | Randee |
clojurians | clojure | hmmm, i think i broke my repl environment, but i have no idea how to debug it.
when refreshing, it throws exceptions on the `(:require ...)` statements of some files that it cannot find certain modules, where they clearly are defined. after some fierce debugging i was able to get things refreshing, but now my webserver's handlers are suddenly undefined (getting "java.lang.IllegalStateException: Attempting to call unbound fn:" errors)
i _think_ something is very wrong somewhere, but i'm unable to pinpoint the issue. sounds like some dangling references / things not getting properly refreshed.
any suggestions ? | 2017-11-11T11:50:05.000074 | Catharine |
clojurians | clojure | it's worth noting that `lein run` and the uberjar created with `lein uberjar` run fine | 2017-11-11T11:51:55.000037 | Catharine |
clojurians | clojure | so i think there's definitely something wrong with my reloaded flow somewhere | 2017-11-11T11:52:07.000021 | Catharine |
clojurians | clojure | I just put together <https://github.com/gfredericks/dot-slash-2>, to address some problems with <https://github.com/palletops/lein-shorthand> | 2017-11-11T12:31:57.000061 | Pearlene |
clojurians | clojure | How best to loop over some data and assert it's valid? I tried putting asserts in a doseq but getting strange results: when there is an exception, that iteration is not called. | 2017-11-11T14:27:42.000084 | Necole |
clojurians | clojure | <@Necole> can you expand a bit on what you're trying to do? Perhaps share some code? | 2017-11-11T14:44:03.000027 | Daniell |
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