Vaadin. Turns out though that my problem was an out of date JDK on this machine. Horribly out of date. Updated it, and now fn-fx tests pass, so likely will try that.

Likely still try out Vaadin though

But won't be able to use for this project...has to be a desktop app (not my requirement, got handed to me)

is there an alternative to (reduced x) if I want to end a reduce early?

that’s the one way to do it

other than something crazy like throwing an exception

that reduced is returned in the context of your chained preds’ input, the reduce is operating on the functions that you are composing

the reduce always completes - it returns a function - then that function has another function inside that returns (reduced nil) when you call it

but reduce isn’t consuming that reduced value, so it doesn’t prevent the propagation

so there is no way to stop the propagation?

because this course hasn't talked about throwing exceptions yet and I probably should stop this another way

you can check for reduced inside you fn x and stop if the previous step returned a reduced

or just use nil and check for that

oh

I guess I'm overcomplicating it

maybe you meant for the reduce to be inside the function you return

rather than using the reduce to create the function you return?

I had meant to use reduce to make the function

I didn't even think about this other possibility

I think I tried doing something with (reduce and (...)) but it didn't let me

Hello there! Does Clojure have a shorthand way to bundle a bunch of defs into a map? I'm currently doing:

(let [[first last email amount] (string/split % #",")]
  {:first first :last last :email email :amount amount}

(zipmap [:first :last :email :amount] (clojure.string/split "Sean,Corfield,[email protected],100.00" #","))
=>
{:amount "100.00", 
 :email "", 
 :first "Sean", 
 :last "Corfield"} 

^ @rgdelato

(assoc *1 :amount "110.00")

@seancorfield thank you! that works

hello comrades, I'm learning macros, I want to concat things somehow like this: (concat ': 'attr '-get-width)

such as (macro win) => (:win-get-width)

is this possible?

@qle-guen A good rule of thumb with macros is to write a function that does almost what you want first, then write a macro that wraps that function.

In this case, if you have a function that accepts a symbol and produces the keyword you want, then a macro is just a simple syntactic wrapper around that.

(and pretty much the "first rule of macros" is "you don't need macros")

@seancorfield thanks but that doesn't really answer my question. Does the function concat exists in this context? Or am I just designing things wrong?

I just got a bunch of *-width keywords and that'd make my code clearer

concat lazily joins together two sequences.

I think you probably want str to join strings together and then keyword to convert the result into a keyword?

(keyword (str attr "-width")) like that?

ok I'll try that, thanks

what is ^ in ^:dynamic?

^ is the metadata marker

This blog does a great job summarize usages of clojure’s non-alphabetical characters. You might find it useful https://yobriefca.se/blog/2014/05/19/the-weird-and-wonderful-characters-of-clojure/

@tap awesome, thanks

how can I clean the contents of ns-interns?

Hi, I would like to save png image (clojure) server-side from base64 encoded string, could you help me? I tried a several method, and something bad.

that'll work

you're gonna need https://github.com/clojure/data.codec

@pkova thanks I test it now!

I got this message. I don’t know why.

Hi, what should I use instead of constructors in Clojure?

data literals (or functions)

ok, thx!

Hello all, how is the way to destructing this?

{"Link_EMBRATEL"
           {:localidade :ITA, :icmp {:jitter 0.89, :perda 0, :latencia 23.0}}}

first element to second

What value are you looking for?

the first one

(let [{e "Link_EMBRATEL"} a
      {localidade :localidade icmp :icmp} e
      {jitter :jitter perda :perda latencia :latencia} icmp]
  ;; ...

where a is (def a {"Link_EMBRATEL" ...})

thanks

How do I make environment variables more convenient? Having to type source some-script.sh with a number of export statements before running my app for local dev is a pain. Using environ, I was under the impression that I could write to .boot-env with a map of EDN key-values and it would be loaded at runtime, but (env :my-key) doesn't seem to work. Am I doing something wrong, or is there a way to leverage environ in a different way?

@petrus .boot-env is an internal file. You can add environment variables programmatically in development by adding them as a map to the environ task.

There’s an example in the README