alt Hacker NewsIt's somewhat similar to Ruby, but it categorically is not Ruby. If you want fast compiled Ruby, TruffleRuby is actually Ruby and relatively compatible with MRI.
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It's sort of like how Nim was sometimes advertised as similar to Python but fast, even though the similarities were pretty surface level. And by having a low level alloc/free available and a principle of performance (it's the first section in their Guides) Crystal could pretend to be a mythical C or C++ replacement. I also remember likening it to Pony at some point, and/or Red, but when I went through a bunch of them years ago they all kind of blended together as just existing because of dissatisfaction (either with performance issues in Python and Ruby, or with various issues of C and C++) while not wanting to join an existing Rust/Go/whatever faction.
Truffle is very good.
Could also use Matz's Spinel Ruby compiler. That's Ruby with static types using RBS but you have to give up some metaprogramming to get it.
I love the idea that we could get ractors written with Spinel and compiled ahead of time. I also love the idea that I can use Ruby for self contained binary tools.
(And for the sake of avoiding confusion, Crystal is also a great project. I'm really pleased to see them continue making progress).
I surely don't want a fast compiled Ruby for the tasks I would use crystal for though.
Like every one else I also used ruby for almost everything back then, usually some hundred of lines or less for processing stuff. but for tasks that run for several hours using ruby was a frustrating experience. slowness and memory consumption aside, the duck typing system and lazy evaluation of method meaning you can run to typo after hours of running session. sure, you can fix it by write the code more carefully, running smoke tests beforehand and other stuff, but it still a chore, and when you write code all days it makes you sloppier.
having a strong typed compiled language helps it immensely, and with crystal you don't have to sacrifice the easiness of programming. and you can compile it to a portable binary and run it everywhere, no need to reinstall a huge toolchain again. (yeah rust or go can also do that, but not for ruby level expressioness language)
I'm sure crystal is not the ideal language for everything you want to use, and ruby is still helpful for what you use daily. but for some tasks, crystal surely has it own advantages. you can write very capable CLI programs without have to install a single library!