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clojurians
clojure
the names must match for the `keys` spec to work
2017-12-28T12:17:55.000093
Shamika
clojurians
clojure
I'm looking for a few more folks to share their workflow in detail over at ClojureVerse: <https://clojureverse.org/t/share-the-nitty-gritty-details-of-your-clojure-workflow/1208> Lots of great productivity hacks both big and small. Both Clojure beginners and experienced devs seem to be getting a lot out of it. :clj:
2017-12-28T12:30:10.000363
Milissa
clojurians
clojure
<@Shamika> thanks for that answer. What would be the best way to spec data where the same keyword is used in different ways? For example, if I’m searching for books and music, both might return data with ‘results’ in it. But the shape of those results will be different.
2017-12-28T12:55:03.000298
Ira
clojurians
clojure
`(s/def ::book-results (s/keys :req-un [::count ::results]))`
2017-12-28T12:55:58.000098
Ira
clojurians
clojure
`(s/def ::music-results (s/keys :req-un [::count ::results]))`
2017-12-28T12:56:21.000073
Ira
clojurians
clojure
So `::results` actually need to point to 2 different specs, but the keywords still need to match the data they are based on.
2017-12-28T12:56:55.000006
Ira
clojurians
clojure
Unless I can do this:
2017-12-28T12:57:11.000246
Ira
clojurians
clojure
`(s/def ::book-results (s/keys :req-un [::count ::book/results]))`
2017-12-28T12:57:41.000110
Ira
clojurians
clojure
I’ll try it…
2017-12-28T12:58:04.000243
Ira
clojurians
clojure
<@Ira> is there anything else in that map that indicates whether it’s a book or music? if so, maybe you could use `multi-spec`
2017-12-28T13:08:24.000025
Shamika
clojurians
clojure
I think I figured it out <@Shamika>.
2017-12-28T13:10:24.000461
Ira
clojurians
clojure
```(s/def :my/result int?) (s/def :your/result pos-int?) (s/def ::test-spec-1 (s/keys :req-un [:my/result])) (s/def ::test-spec-2 (s/keys :req-un [:your/result])) ```
2017-12-28T13:10:28.000094
Ira
clojurians
clojure
```(s/valid? ::test-spec-1 {:result -2})```
2017-12-28T13:11:15.000012
Ira
clojurians
clojure
is valid
2017-12-28T13:11:32.000295
Ira
clojurians
clojure
```(s/valid? ::test-spec-2 {:result -2})```
2017-12-28T13:11:40.000083
Ira
clojurians
clojure
is not
2017-12-28T13:11:41.000236
Ira
clojurians
clojure
Does spec have any impact on parsing XML?
2017-12-28T15:27:50.000347
Ira
clojurians
clojure
<@Ira> how do you mean?
2017-12-28T15:28:26.000128
Jodie
clojurians
clojure
Well, I’m about to pitch my CTO on Clojure and spec, and we consume a lot of XML API’s. I’d like to know definitively how they relate, and if spec is an advantage here or not.
2017-12-28T15:29:07.000181
Ira
clojurians
clojure
<@Ira> I don't think there's much advantage, you could spec those XML APIs, and generate clojure.data.xml data structures automatically from them, to ensure that you have high coverage of the various data shapes that could be thrown at you from those APIs.
2017-12-28T15:30:27.000253
Jodie
clojurians
clojure
Spec is really "one layer down" from application APIs, and is more centered around function APIs.
2017-12-28T15:31:02.000379
Jodie
clojurians
clojure
Hmm. I see spec as a great way to validate calls to third-party API’s.
2017-12-28T15:31:33.000200
Ira
clojurians
clojure
I’m trying to talk a Scala CTO into allowing some Clojure pilot projects. A big part of the argument is what spec brings to the table.
2017-12-28T15:32:50.000029
Ira
clojurians
clojure
When you say "consume a lot of XML APIs" do you mean you POST XML to them or you get XML responses back? In either case you could convert from/to a Clojure data structure and spec validate that Clojure data structure.
2017-12-28T15:33:35.000048
Daniell
clojurians
clojure
And we make quite a few XML calls.
2017-12-28T15:33:39.000030
Ira
clojurians
clojure
Hmm, good question <@Daniell>
2017-12-28T15:34:07.000172
Ira
clojurians
clojure
One of the reasons we initially tried Scala was that we had a problem that involved reading a SQL DB and generating XML to POST to a search engine -- and Scala has XML literals native in the language.
2017-12-28T15:34:30.000249
Daniell
clojurians
clojure
It will be a mix of both. I want to demo the worst-case scenario, even if we end up working with JSON.
2017-12-28T15:34:39.000275
Ira
clojurians
clojure
When we switched to Clojure, we used Hiccup to generate XML and that just transforms Clojure data structures so those could, in theory, be spec'd.
2017-12-28T15:35:17.000144
Daniell
clojurians
clojure
Nice. I think we want to demo how we can consume changing API’s in Clojure more easily than in Scala.
2017-12-28T15:35:59.000123
Ira
clojurians
clojure
So it’s more a concern with what we get from the vendor, than what we send them.
2017-12-28T15:36:27.000381
Ira
clojurians
clojure
Converting XML to Clojure data structures is pretty painful in my experience.
2017-12-28T15:37:05.000325
Daniell
clojurians
clojure
Ugh.
2017-12-28T15:37:40.000002
Ira
clojurians
clojure
Thanks!
2017-12-28T15:38:00.000204
Glory
clojurians
clojure
I’m working on a live coding demo with spec and JSON API returns.
2017-12-28T15:39:05.000256
Ira
clojurians
clojure
XML is a real-world concern.
2017-12-28T15:39:20.000250
Ira
clojurians
clojure
Cause some vendors still use it, and won’t be changing anytime soon.
2017-12-28T15:39:34.000360
Ira
clojurians
clojure
<@Daniell> Oh really? We've been using clojure.data.xml internally for docbook stuff &amp; it's been fairly good.
2017-12-28T15:39:37.000161
Jodie
clojurians
clojure
We use `clojure.data.xml` in one place for a simple XML API response and also with `clojure.data.zip.xml` in another place for parsing a complex XML document -- lots of manual code mapping from the XML structure to the Clojure data structure we want.
2017-12-28T15:40:30.000258
Daniell
clojurians
clojure
Where is XSLT when you need it? :wink:
2017-12-28T15:41:08.000413
Ira
clojurians
clojure
I didn't use it for xml, but <https://github.com/halgari/odin/> had some nice helpers for xml, and might be a suitable XSLT-like tool.
2017-12-28T15:41:14.000355
Jodie
clojurians
clojure
recently I made a toy clojure program that plays the wikipedia philosophy game (as a demo of a debugging library I wrote) and tree-seq plus clojure.xml was good enough for the little dumb thing I was doing <https://github.com/noisesmith/philoseek>
2017-12-28T15:43:42.000086
Margaret
clojurians
clojure
We have lots of stuff like `(-&gt;boolean (or (zx/xml1-&gt; node :required zx/text) false))` and `(-&gt;long (or (zx/attr node :minimum) 0))` and what is basically a custom recursive descent parser for the XML format :disappointed:
2017-12-28T15:43:54.000262
Daniell
clojurians
clojure
(since XML is all plain text and we want Boolean, Long, Date etc from it)
2017-12-28T15:44:28.000348
Daniell
clojurians
clojure
Agh!
2017-12-28T15:46:41.000314
Elijah
clojurians
clojure
lol why does yours have such a huge picture compared to everyone else
2017-12-28T15:46:54.000142
Williemae
clojurians
clojure
That sucks so bad. :stuck_out_tongue:
2017-12-28T15:47:10.000066
Elijah
clojurians
clojure
I can’t remove the attachment on mobile, either!
2017-12-28T15:47:27.000194
Elijah
clojurians
clojure
brb setting my gh profile pic to longcat
2017-12-28T15:47:43.000355
Margaret
clojurians
clojure
ah just put it up we’ll get over it
2017-12-28T15:47:48.000241
Williemae
clojurians
clojure
<https://github.com/eerohele/sigel>
2017-12-28T15:48:03.000104
Jodie
clojurians
clojure
Whatever, can’t be bothered. I’d rather not plaster my ugly mug here again. :stuck_out_tongue:
2017-12-28T15:48:04.000211
Elijah
clojurians
clojure
Better? :smile:
2017-12-28T15:48:10.000155
Jodie
clojurians
clojure
Thanks! Yes.
2017-12-28T15:48:14.000116
Elijah
clojurians
clojure
fwiw, I didn't see it as big (but I tweaked stuff a little)
2017-12-28T15:48:18.000042
Jodie
clojurians
clojure
well when you posted it initially it didnt have such a big picture, it’s just when flowthing posts it lol
2017-12-28T15:48:28.000058
Williemae
clojurians
clojure
shows up normally for me too (tested in my dm)
2017-12-28T15:49:48.000121
Williemae
clojurians
clojure
Though in the spirit of full disclosure, I wouldn’t call that library exactly “battle-tested”… I just wanted to see whether you can write XSLT with parentheses instead of angle brackets, more or less. :stuck_out_tongue:
2017-12-28T15:49:51.000202
Elijah
clojurians
clojure
I could always turn off previews from <http://github.com|github.com> but the summary is often useful (even if the picture not so much)
2017-12-28T15:49:53.000051
Daniell
clojurians
clojure
But the XPath bits might be useful for querying XML documents, I guess.
2017-12-28T15:50:41.000085
Elijah
clojurians
clojure
<@Daniell> yeah, no need, it’s just weird that Slack uses that humongous version of my profile picture every time… gotta try to figure out why sometime.
2017-12-28T15:52:35.000087
Elijah
clojurians
clojure
Justin and I have talked about it a couple times but haven’t buckled down to do it. It’s on my list for January
2017-12-28T19:52:26.000092
Sonny
clojurians
clojure
Hey guys. I'm just starting out with clojure and reagent, was wondering why luminus does this ``` (defn mount-components [] (r/render [#'navigation/navbar] (.getElementById js/document "navbar")) (r/render [#'router/current-page] (.getElementById js/document "app"))) ;; --------^ why hash quote? it works fine without it too ```
2017-12-29T04:32:08.000046
Alessandra
clojurians
clojure
that's probably so they reference the var rather than the function itself...so when they reload the file containing router/current-page the new value of the var is taken into account
2017-12-29T05:35:02.000002
Amee
clojurians
clojure
i guess the router/current-page var must have the ^:dynamic meta data
2017-12-29T05:35:26.000162
Amee
clojurians
clojure
router/current page is a multimethod. Anyways, it's not a big deal right now, was just curious. I'll read up on vars at some point
2017-12-29T05:40:02.000215
Alessandra
clojurians
clojure
what about navbar ?
2017-12-29T05:41:04.000160
Amee
clojurians
clojure
clojurescript has slightly different semantic for vars, not quite sure that's appropriate or not
2017-12-29T05:41:37.000012
Amee
clojurians
clojure
simple reagent component. ``` (defn navbar [] (fn [] [:nav.navbar.navbar-dark.bg-primary ... ```
2017-12-29T05:42:04.000150
Alessandra
clojurians
clojure
try this : remove the #' for the navbar code ... load that file ...then modify your navbar and load that file
2017-12-29T05:43:00.000108
Amee
clojurians
clojure
check if you see your modification
2017-12-29T05:43:45.000189
Amee
clojurians
clojure
i can see the changes
2017-12-29T05:44:00.000152
Alessandra
clojurians
clojure
ahwell =)
2017-12-29T05:44:06.000234
Amee
clojurians
clojure
i use this trick in clojure code
2017-12-29T05:44:26.000012
Amee
clojurians
clojure
you're using figwheel ?
2017-12-29T05:44:59.000001
Amee
clojurians
clojure
yep. maybe it's one of those good practice kind of things
2017-12-29T05:45:24.000115
Alessandra
clojurians
clojure
for clojure code that's quite necessary during development. I'm not sure about clojurescript
2017-12-29T05:46:40.000087
Amee
clojurians
clojure
I'll try removing it in clojure code, see if I still get my changes reloaded
2017-12-29T05:48:00.000145
Alessandra
clojurians
clojure
#'foo is a shorthand for (var foo)
2017-12-29T05:49:25.000242
Amee
clojurians
clojure
a simple test, in ns a have : (def a b/b) , in ns b have : (def b 1) ... if you change b and reload the ns b, a should still be 1, unless you set b dynamic and change a to (def a #'b/b)
2017-12-29T05:51:57.000131
Amee
clojurians
clojure
alright, it's making some sense. thank you for taking your time to explain :slightly_smiling_face:
2017-12-29T05:59:24.000212
Alessandra
clojurians
clojure
hi all
2017-12-29T07:48:12.000131
Sam
clojurians
clojure
another disillusioned java-dev jumping on board :slightly_smiling_face:
2017-12-29T07:48:52.000068
Sam
clojurians
clojure
i'm not bitter! really!
2017-12-29T07:49:17.000074
Sam
clojurians
clojure
I’m not bitter either, I’m having too much fun writing clojure :wink:
2017-12-29T07:56:29.000184
Marx
clojurians
clojure
could anyone explain the rationale for the following?
2017-12-29T12:15:10.000059
Venessa
clojurians
clojure
``` (def foo {:a 1}) (when-let [a (:a foo)] (println a)) ;; =&gt; prints "1", returns nil (when-let [{:keys [a]} foo] (println a)) ;; =&gt; prints "1", returns nil (when-let [a (:a (assoc foo :a nil))] (println a)) ;; =&gt; returns nil (when-let [{:keys [a]} (assoc foo :a nil)] (println a)) ;; =&gt; prints "nil", returns nil ```
2017-12-29T12:15:13.000266
Venessa
clojurians
clojure
i would like for the final expression to not print “nil”, ie the destructuring bind on a nil key to not evaluate the body of the when
2017-12-29T12:16:27.000213
Venessa
clojurians
clojure
does clojure have a distinction between a missing and nil key in its map type?
2017-12-29T12:16:48.000220
Venessa
clojurians
clojure
<@Venessa>it's because the value pre-destructuring is not nil.
2017-12-29T12:16:55.000088
Jodie
clojurians
clojure
It does, you can use `contains?` to distinguish the 2.
2017-12-29T12:17:05.000243
Jodie
clojurians
clojure
right
2017-12-29T12:17:16.000208
Venessa
clojurians
clojure
ok thanks <@Jodie>
2017-12-29T12:17:21.000276
Venessa
clojurians
clojure
so the idea is that the expression used as the value for that binding must be nil for the `when` to not execute?
2017-12-29T12:18:32.000145
Venessa
clojurians
clojure
contains has nothing to do with what <@Venessa> is asking here -- there's just no way to use `when-let`/`if-let` on destructured values
2017-12-29T12:19:49.000137
Kareen
clojurians
clojure
when you do `(when-let [{:keys [a]} x] ..)` the when-let is testing on the value of `x`
2017-12-29T12:20:08.000258
Kareen
clojurians
clojure
<@Kareen> no that was helpful! i get its not exactly related to my example under question
2017-12-29T12:20:18.000074
Venessa
clojurians
clojure
because it expands to something like `(when-let [the-map x] (let [{:keys [a]} the-map ..))`
2017-12-29T12:20:30.000252
Kareen
clojurians
clojure
right
2017-12-29T12:20:36.000294
Venessa
clojurians
clojure
(that's not the macroexpansion at all, just what it's doing logically)
2017-12-29T12:20:52.000073
Kareen