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RBS, Ruby’s new type signature language

(developer.squareup.com)
511 points mootrichard | 2 comments | 29 Jul 20 18:04 UTC | HN request time: 0.003s | source
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davidkellis ◴[29 Jul 20 18:50 UTC] No.23990278[source]▶
At some point it makes more sense to switch to Crystal.
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loktarogar ◴[29 Jul 20 19:48 UTC] No.23990838[source]▶
Crystal is pretty unstable at the moment (in that it changes often). I have a very small project in crystal (discord bot with only a couple of commands that CRUDs a database). Every time I deploy to heroku, if heroku updated crystal, the bot breaks. I have to spend an hour determining what broke. The language changes so often that either I update with heroku or I can't use any newer libraries for development.

And then you get stuck in very opaque error loops with the typing where it's expecting eg. a Number. no, not that number, a different type of number. no, not that type either. no, not that type. Most the code i've written has been typecasting.

Crystal does have some significant benefits over Ruby (which is why i'm using it - better memory use, better for scaling for my purpose) but I just spent time rewriting the non-user facing, non-scaling part of the bot in Ruby so I could actually get stuff done instead of fighting the language.

Of course a lot of this might be my inexperience with Crystal, but as a Ruby dev for 13 years, it's not as easy as just switching over from Ruby to Crystal. I've had this bot running 4 years and it hasn't got any easier for me.

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1. 3by7 ◴[29 Jul 20 20:11 UTC] No.23991030[source]▶
> Every time I deploy to heroku, if heroku updated crystal, the bot breaks

Have you tried adding a `.crystal-version` file as described in the buildpack's README? https://github.com/crystal-lang/heroku-buildpack-crystal#cry...

replies(1): >>23992116 #
2. loktarogar ◴[29 Jul 20 22:07 UTC] No.23992116[source]▶
Yeah, the issue is more that I can either keep Crystal updated and use all libraries, or keep it frozen and be restricted in what I use. It's not mature enough yet to be able to lock it down and have more or less Crystal's entire shard collection available to me, like I can do in Ruby. Reminds me more of Ruby a decade ago with 1.8.7 and 1.9.2 and 2.0 (which is fine for it to be at, esp for an evolving language, but it's not "there yet" to be a replacement for Ruby)

One incident that stands out is that certain Postgres support was only available in the latest version of a shard, which required the latest version of Crystal, which wasn't compatible with 3 of the other shards I was using.