Fork me on GitHub

@michael.e.loughlin Normally, in Clojure/Script, you'd just have a single atom with in your case a hash map of file paths to values. You can swap! in new "file" contents with (swap! db assoc "path/to/file" new-contents) and you can add new elements to files like this (swap! db assoc-in ["path/to/file" file-key] sub-content)


And your db would be (atom {"path/to/file/1" {:a 1, :b 2} "path/to/another/file" {:x 22 :y 33}})


In general, the designed use case for atoms, refs, and agents is that if they contain immutable values, you are safe. If they themselves contain mutable values, I would think 7 times carefully about corner cases before relying on it.

Matthew Pettis02:01:16

Hi, is there a way to use quote/splice/eval to evaluate a defrecord definition if I have a list of symbols? I have the following toy example:


Yes, you almost got it:

`(defrecord ~'Myrec [[email protected]])
That's with a backtick at the front


`(~'defrecord ~'Myrec [[email protected]])


You shouldn't quote defrecord


yeah, the expansion will produce clojure.core/defrecord without the quote.


And that's probably correct


It depends if you want to use the defrecord defined in the namespace which is doing the expansion, or the one which is being expanded into.

🚀 4
Matthew Pettis02:01:09

I think I want the first one -- it expands to clojure.core/defrecord, but I'm not sure which of those two options that fulfills...


Then you want:

`(defrecord ~'Myrec [[email protected]])


That means that even if there is a defrecord defined in the namespace being expanded into, it will still use the defrecord macro from clojure.core

Matthew Pettis02:01:12

Though the second answer above gives no namespace, so I think I'm seeing what you mean. So I think in my particular case it doesn't matter, since I don't redefine defrecord, and will ultimately both resolve to clojure.core. But this helps me sort some of this stuff...


Ya, its going to be rare, but say you gave it away as a library, you can't assume that the consumer didn't shadow defrecord (even if that be pretty weird in this case).

👍 8

Hey guys, i would like to evaluate expressions in cursive ide similar to how it's done in this picture. Could anyone explain to me how this works?


I do not use Cursive and do not know the answer to your question. You may get an answer here, but in case not I wanted to mention that there is a #cursive channel in this Slack that the Cursive developer and others often answer questions


ty i'll give it a try


What you’re looking for is Cmd+shift+p


what you guys recommend as a math library? I need to use some optimizer such as Newton Raphson method,


Which does make use of Apache Commons Math and others under the hood


greaat!! Thanks @U0K064KQV o///