Ruby 3.0 Preview 1

Post by sandstrom » Sun, Sep 27, 2020, 11:36 AM UTC

sosodev wrote: post #189

sickcodebruh wrote: post #55

Didn’t see it linked in the preview announcement, here’s the RBS syntax guide: https://github.com/ruby/rbs/blob/master/docs/syntax.md Glanced at it from my phone but it looks good! I’m looking forward to seeing it in RubyMine. Still sad that we can’t write these in .rb files but I wonder if the plan is to go the other way, eventually permit typed code in .rbs? Does anyone know what the story will be with third-party…

It seems like the intent is for RBS to be auto generated from other tooling. Sorbet for example lets you write inline type definitions and is planned to fully integrate with RBS. The other good thing about RBS being in separate files is it can be integrated into a library without breaking compatibility with older Ruby versions.

Post by rco8786 » Mon, Sep 28, 2020, 11:22 AM UTC

inopinatus wrote: post #123

rco8786 wrote: post #66

This is all great stuff. I’m rather meh on RBS, mainly because separating types from code is less than ideal but I like the potential here. But the right hand assignment operator. What on earth. Nobody asked for that and nobody wants it. Why.

Ruby already had a sort of limited form of rightward assignment, in exception rescue: begin #... do something rescue StandardError => ex #... handle exception end The ex here can be any assignment expression, it's not just a lexical variable. So you could already do this: class Guru def meditate=(exception) puts "caught #{exception.inspect}" end end # later ... rescue OutOfCheeseError => Guru.new.meditate i.e. creati…

    def my_method
        .. code ..
    rescue FileNotFoundError => FileNotFoundHandler
    rescue StandardError => StandardErrorHandler
    end

Post by cageface » Tue, Sep 29, 2020, 7:03 AM UTC

cutler wrote: post #163

cageface wrote: post #111

Earlier quoted context omitted.

In a sense Ruby is sort of a cleaned up Perl but maybe not cleaned up enough. I fell totally in love with it almost 20 years ago but these days I think we have better languages to choose from even if their ecosystems aren't always as rich.

You mean like Dart and Go? For expressivity I'll stick with dirty old Ruby, thanks.

Post by strken » Sat, Oct 03, 2020, 11:33 AM UTC

mosselman wrote: post #202

tinus_hn wrote: post #193

Earlier quoted context omitted.

They are not synonyms, they mean slightly different things. And that is the problem. Because for small datasets the difference doesn’t matter this results in beginner programmers choosing randomly, which 2/3 of time is the wrong choice.

So if 'length' was the only option and I'd have to do ActiveRecord::Base.connection.execute('SELECT count(*) FROM users').values.first or something it would all be fine?

    users.select(count_star()).first(&connection)

    User.first{|t| t.count}
    User.first{|t| t.count}.execute!
    User.execute{|t| t.count}.values.first
    # ...etc.