👋

Good Morning!

morning

morning

Morn'

mån¡

Mórning

I was a bit surprised to learn that destructuring a map, that has a nil, using either when-some or when-let doesn't do what I thought it might do

i.e.,

(def config {:foo {:bar nil}})

(when-some [{{:keys [bar]} :foo} config]
  (format "This is %s" bar)) ;; "This is null"

The doc's say that when-some will only evaluate the body if the test is not nil.

the test is the whole bound value @dharrigan, not something destructured out of it - and config is not nil

that makes sense, yup. still, had to learn that 🙂

so is there a better way of writing this so that if "bar" is nil, then not to execute the body?

I was thinking of just testing again i.e., a nested (when bar ,,,,,)

Have people seen this by any chance? https://github.com/IGJoshua/farolero

I was reading about it this weekend, prompted by the blog posting

I've not used CL style exceptions much, but they seem handy, I'm assuming they handle normal js / java exceptions as well, would be cool to see some more interesting things happening here 😃...

Can you link the blog post? I don't think I've seen it...

My current understanding, and I believe something the blog author also comments upon, is that because (at least on the JVM) Clojure, being a hosted language, the normal paradigms of try, catch and if-some (and the ilk) are very common, then it may feel a bit unnatural

I'm not sure tbh, I will definitely need to spend some more time experimenting and learning to see if it works for me 😉

Here's the blog post btw:

Thanks 😃... I mean I'm hoping it will allow for more flexibility in dealing with exceptions...

Yes, agreed. I am eager to delve further into it and see if can help my applications 🙂

If I recall, someone here got the "Software Design for Flexibility" book by Chris Hanson and Gerald Jay Sussman

Interested to hear a quick opinion on it 🙂