Though once I was writing some lisp to fix a problem we were having and I had a developer beside me and he was blown away by what was happening. I think that the interactivity is something which must be experienced to be fully appreciated.
I use it at my current start up and could not imagine using another language. I've become too used to this kind of workflow.
edit: My advice to young and overly curious developers: never talk about weird languages at work. I don’t know what’s with it but you’ll trigger a visceral and almost violent reaction from the average developer who thinks their livelihood is in danger. It’s just not worth it. And no this isn’t fixed with joining a FAANG.
That’s funny, because what drew me to doing TDD in Java was how much I could treat the test runner like sending the current form to the REPL in SLIME.
Indeed, I had a similar experience. When quick iteration is helpful it shines.
What implementations are you using, and how are you running it in production, if it is not a secret? Any performance issue with the GC at large scale?
CCL is used locally for two reasons 1) error messages are better and 2) it ensures that we're writing portable code. SBCL is used in production because it's much faster and it's constantly being updated, so we get cool things for free. I have been eyeing lispworks but I don't know that it offers much benefit right now. We do plan on mobile apps at some point and that's a conversation we'll have with them.
Production itself is pretty much just a live image, not much different than what you'd have when you're developing. We use slynk to be able to connect to it and play with the data. Can see that here [0].
GC hasn't caused an issue yet. I imagine we will run into issues latter half of this year when we roll out alerts but those are challenges which can be overcome. That might even be a lispworks thing honestly.
If you end up blogging about CL (and tech in general) at Feetr, know that there will be at least one interested reader :)
It's something that I'd love to do, especially as there aren't many people using it in production, or at least talking about it, and I think that showing people it's a viable language could be important.
It's a shame that we as a community still throw around the Grammarly article as proof of people using it, I wish we had more recent examples.
Also, now that I've decided to go solo-entrepreneur, there is no one that can laugh at me if I decide to use CL for a core system.
Looking forward to reading your blog.
Especially in finance where most of the effort is geared towards data and data manipulation, it's almost a super power being able to work with live data and live systems. Your development speed is going to 10x.
I wish you all the best on your journey! Can't wait to see what you come up with!
Could you recommend some videos of live development with CL that aren't for toy examples? I don't know any lisp, but I'd like to see how different it is from other semi-interactive programming languages like Matlab, Python, etc.
https://www.youtube.com/watch?v=nSJcuOLmkl8&list=PLTA6M4yZF0...
We use Postmodern for Postgres interaction. Have no complaints at all. You're able to use s-sql which is SQL statements as s-exps but can drop into just passing it strings if required.
Dexador is how we're doing web scraping (and requests should we need to). Top tier, no complaints. Exactly what you want from it. Plump and lquery are also used for parsing HTML
Jonathan is where I'll fight with most people in the CL community. It's the best JSON library. When I say fight, I mean it, I'll throw hands at anyone recommending cl-json or jsown.
Local-time is something we depend upon a lot. Great for timestamp manipulation.
cl-cron for scheduling. I like it well enough.
I'm also a big fan of Hunchentoot for the web requests. All static pages (currently all addressable webpages) are generated by Spinneret.
There's a few more libraries but they may be more niche or more specific to us.
You'll want for nothing but the great thing about lisp, in my opinion, is that it's /so/ easy to create. A good article on this is The Lisp Curse[0], which argues that its power is a bad thing as it prevents communities from forming but as a developer, I want to use the best tools available. If that results in me, as a business owner, requiring less people then that's a win to me.
Creating and redefining functions on a running program is incredible to experience. The turn around time for feature is so much quicker because you can, for example, save a web request and continue applying it to functions until you figure what's wrong.
You're also able to inspect data just by clicking on it. For example, I can define a class, create an instance of it and then click on it to see its data. https://i.imgur.com/4jydmBy.png
Another interesting feature is how errors are handled. If you encounter one which causes the program to stop, it'll raise a frame from which you can choose what it should do next. Should it continue anyway or retry, maybe you should redefine a function, maybe you want to change some of the data. Options are endless.
Something else that I don't use nearly as much as I should is the labels feature from SLY, which allows you to mark certain sexps and record the data that gets passed through them. Image here: http://joaotavora.github.io/sly/images/tutorial-6.png
There is so much more that could be mentioned and I'm sure there are other people with their own favourite features but these are mine.
For a longer visual introduction, I have been enjoying kaveh808's videos: https://youtube.com/playlist?list=PLTA6M4yZF0MzsMlNL0N67tIU1...
This longer demo of an early version of kons-9 talks about some CL features:
https://www.youtube.com/watch?v=NJe4isZ7NHI&list=PLTA6M4yZF0...