* From python for anything web + data science. Again, why not have your whole stack be in one language?
* From lack of hype. Rails is still evolving, but a lot of packages are not seeing releases (I have used packages 3-4 years old). This indicates to me that the energy isn't there in the community the way it used to be. I have seen the consultants who are always on the bleeding edge move on to elixir.
That said I have seen plenty of startups using ruby (really rails) and staffing when I hired for ruby wasn't an issue.
I do help run a local ruby meetup and attendance is good but not exceptional (15-40 people every month). So that may skew my viewpoint.
I’ve written an API once from scratch. Actually twice. First time in Modena, because it was all the hype, but it was arcane. Then Sinatra, where I ended up creating all of the above. Rails is excellent for APIs.
Rust is nice, but I’m not sure if I’d like it for all of an API. I don’t like go. Crystal seems great, because it’s typed and it’s also super fast.
With the rise in ML and data science over the past years, Python finally has a killer app that no other scripting languages come close to touching. I migrated completely from Ruby when I started dabbling in ML, Pandas, etc.
I used a different screen (having people make change based on an arbitrary amount, so if the input was 81, you'd return [25, 25, 25, 5, 1], as we were in the USA) and it was also helpful. I didn't track the number of people that it stymied though.
(I always feel weird talking about interview questions publicly, but honestly anyone who prepares that diligently deserves to go to the next stage. If anyone's reading this because they're preparing for an interview with me and I ask this question, just mention this comment and I'll be impressed.)
Wish there are more useful projects written in ruby :)
I had managed to get a job as a Java developer a long time ago, but at that time all I could do was barely write toy apps in Java and I had no exposure to stuff like design patterns. The whole experience left me in a bad place. Now after all these years, Ruby feels like a breath of fresh air, and the texts that I have come across on the subject - Design Patterns in Ruby, Practical OOD in Ruby, Ruby under a Microscope etc. have increased my interest in the language.
But more and more frequent articles on Ruby's decline are pretty disheartening.