Clojurians Log v2

you probably want something like:

(with-open [rdr (<http://clojure.java.io/reader|clojure.java.io/reader> "page")
            pb-rdr (java.io.PushbackReader. rdr)]
  (clojure.edn/read pb-rdr))

but there are several ways to read an edn file depending on the exact semantics required

thanks! string and vector respectively… it balks at a conversion of the string to a vector via vec, however.

It’s not technically an edn file.

well, you need some way to parse the file. what type of file is it?

throws

[ is not a valid element name.

check (prn (vec (slurp "page")))

in this case, no type, just a plain file.

does the file contain edn?

if it contains edn, then clojure.edn/read should work

it doesn’t.

just the plain vector.

just

[:html [:p "hello"]]

(prn (vec (slurp "page")))

[\[ \: \h \t \m \l \space \[ \: \p \space \" \h \e \l \l \o \" \] \]]

and when it’s fed into hiccup, it complains that

[ is not a valid element name.

the above code with the edn reader should work

ok, I can give that a go.

you'll probably need to require:

(require '<http://clojure.java.io|clojure.java.io>
          'clojure.edn)

seems to be available, but that throws

java.lang.String cannot be cast to java.io.PushbackReader

so weird. basically, I just can’t coerce the file into a proper vector, it seems.

are you copied the code correctly?

for eg.:

(with-open [rdr (<http://clojure.java.io/reader|clojure.java.io/reader> "deps.edn")
            pb-rdr (java.io.PushbackReader. rdr)]
  (clojure.edn/read pb-rdr))

another way to read edn data from a file is (read-string (slurp "page")) although it will cause issues for some edge cases

I got it!

(read-string (slurp "page"))

and totally grateful for the help!

I'm looking into licenses and ClojureScript is under EPL along with a lot of ClojureScript libraries. Since JavaScript in a browser is technically a distribution (from what I understand) then anyone developing a website with ClojureScript would have to disclose the source code and also include the EPL license. Is my understanding of this correct?

https://en.wikipedia.org/wiki/Eclipse_Public_License#Derivative_works

"Linking to code (for example to a library) licensed under EPL automatically does not mean that your program is a derivative work."

As long as you are not modifying clojurescript or lib source code you are fine.

this is what I understand.

Thanks @phoenixai2082, that would make sense. If anyone else has a different view, please share!

Hi There, I am working on a react-app, I have this function for for map icons, I am having an issue when I click on Icons in  `yarn start`  it works (it gets the id), but when I use the `yarn build`  build file and click on Icon, it gets id as nil. I am not sure whats causing this to behave this way. Uncaught (in promise) Error: Vector's key for assoc must be a number.

(defn on-click-map-icons [event props page]
     (def feature (first event.features))
        (println feature.properties.itemid)
    (when (= page "results")
    (if   (= feature.source "selected-item") (router/redirect! props :router {:page "item" :item (:id {:id itemid })}) ))
    (when (= page "item")
        (if (= feature.source "subitem")
          (router/redirect! props :router {:page "item" :item (:id {:id itemid } ) :subitem (:sub-id {:sub-id subitemid})  }))))

Don't use . that way. Stuff like event.features should be (.-features ^js event). The ^js part can be there only once where you first define the name - in this case, right in the signature, like [^js event props page].

Thanks @p-himik for pointing that out, I’ve tried using

(defn on-click-map-icons [event props page]
     (def feature (first (.-features ^js event)))
    (when (= page "results")
    (if   (= feature.source "selected-item") (router/redirect! props :router {:page "item" :item (:id {:id feature.properties.itemid })}) ))
    (when (= page "item")
        (if (= feature.source "subitem")
          (router/redirect! props :router {:page "item" :item (:id {:id itemid } ) :subitem (:sub-id {:sub-id feature.properties.subitemid})  }))))

I didn't mean just that interop with event - I meant all interop field access in your code.

Also, you probably want to use let instead of def.

Ah I see

@p-himik I am able to get to properties like

(.-properties ^js feature) 
#js {:title sample_note,  :noteid 3}

Choose any one or a combination or them:

(.. feature -properties -title)
(.-title (.-properties feature))
(-> feature .-properties .-title)
(. (. feature -properties) -title)

CLJS/JS interop and CLJ/Java interop are almost identical. Completely identical if you don't go outside of the . and -.

Thank You

When using webpack in javascript, I can do something like:

function dynamic-load() {
  require("path/to/module");
}

No, all requires have to be a part of an ns form. I'm not familiar with dynamic load in webpack. Is it loading the module during the run time, when e.g. some relevant component is requested? If so, then CLJS have module splitting for that.

I’m using ^:export to export a sort-of feature flag to be changed from the console but it looks like the boolean value is inlined wherever it is being used, meaning setting it does not actually propagate to the various sites where it’s used. Is there a way to avoid this type of inlining for specific vars? (In the meantime I fixed this by using an atom.)

@martinklepsch I don't think you can export value? I recall running into this - only functions

writing a CLJC lib that returns either Clojure promise or a JS Promise and really missing async/`await` 😞

gotta split my test suite between CLJ and CLJS, even though the semantics are basically the same

the dream would be I could do:

#?(:clj @(f/send n msg)
   :cljs (await (f/send n msg)))