4 ms·

easter-egg.rb

76 points by syspec 6y ago

syspec 6y ago
I stumbled onto this when looking at the ruby source code, anyone know how to trigger it?
- rafadc 6y ago
  Just copy the contents in a file and gem install reline ruby yourfile.rb It is a nice ascii demo of a ruby turning around
- q3k 6y ago
  On Ruby 2.7+, run irb, type 'RubyVM', press tab twice.
  - relyks 6y ago
    Super cool, didn't know you could do that :)
  - jbverschoor 6y ago
    You have to try a few times to get the logo or dancing logo
  - syspec 6y ago
    Thanks! Very cool - here's a gif for the curious: https://media1.giphy.com/media/L0eN2GwpS7GOmv5Kk7/giphy.gif https://media1.giphy.com/media/L0eN2GwpS7GOmv5Kk7/giphy.gif
- relyks 6y ago
  Run irb and input 'IRB.send(:easter_egg)'. Also, if you have the downloaded source, you can just run the source file directly because of the last line of code.
sdwolfz 6y ago
Here's a one liner: ruby -r irb -e 'IRB.send(:easter_egg)' And in Docker you get a static image, but sometimes, randomly you get the dynamic one... docker run --rm -it ruby:2.7.1-alpine ruby -r irb -e 'IRB.send(:easter_egg)'
- jsjohnst 6y ago
  Make it: IRB.send(:easter_egg, :dancing) And you should always get the animated one.
  - sdwolfz 6y ago
    Yes, can confirm it works without failure!
derefr 6y ago
A tangent, but: I've read and written a lot of Ruby—except never much of the stdlib, for some reason—and I've literally never seen anyone use the `private` pseudo-keyword in the Java-esque way it's used here (`private def foo...` on the same line), to the point that I didn't even realize that that was possible. I've always only seen these usages: • `private` on its own line with surrounding whitespace, treated as a section-break in the class, where it has a "mode-switch for all that follows" effect similar to `private:` in C++. • `private :foo` on a separate line after `def foo...`, where it's just acting as a standalone call to one of Class's "builder" DSL methods, like an `attr_reader` call. • `private\ndef foo` (rare), as if `private` were some Java-like annotation modifying just the following method (though this is really just the first mode-switching kind, and later methods will need a `public\n` "annotation" to go back.) Why is that? It seems startlingly obvious, once you see it done, that `private def ...` is the idiomatic way to use it. (After all, they bothered to make `def` return the symbolic name of the function you defined, just so you could chain it into class-builder-methods like this.)
- abhorrence 6y ago
  def returning the method name as a symbol wasn’t added until ruby 2.1, and doesn’t seem to have been compelling enough to cause people to change their ways.
- dragonwriter 6y ago
  > It seems startlingly obvious, once you see it done, that `private def ...` is the idiomatic way to use it. As you note that almost no one does it in Ruby, it is not the idiomatic way in Ruby. Idioms change slowly, and this wasn't supported for most of Ruby history.

76 points by syspec 6y ago

syspec 6y ago

I stumbled onto this when looking at the ruby source code, anyone know how to trigger it?

rafadc 6y ago
Just copy the contents in a file and gem install reline ruby yourfile.rb It is a nice ascii demo of a ruby turning around
q3k 6y ago
On Ruby 2.7+, run irb, type 'RubyVM', press tab twice.
- relyks 6y ago
  Super cool, didn't know you could do that :)
- jbverschoor 6y ago
  You have to try a few times to get the logo or dancing logo
- syspec 6y ago
  Thanks! Very cool - here's a gif for the curious: https://media1.giphy.com/media/L0eN2GwpS7GOmv5Kk7/giphy.gif https://media1.giphy.com/media/L0eN2GwpS7GOmv5Kk7/giphy.gif
relyks 6y ago
Run irb and input 'IRB.send(:easter_egg)'. Also, if you have the downloaded source, you can just run the source file directly because of the last line of code.

sdwolfz 6y ago

Here's a one liner: ruby -r irb -e 'IRB.send(:easter_egg)' And in Docker you get a static image, but sometimes, randomly you get the dynamic one... docker run --rm -it ruby:2.7.1-alpine ruby -r irb -e 'IRB.send(:easter_egg)'

jsjohnst 6y ago
Make it: IRB.send(:easter_egg, :dancing) And you should always get the animated one.
- sdwolfz 6y ago
  Yes, can confirm it works without failure!

derefr 6y ago

A tangent, but: I've read and written a lot of Ruby—except never much of the stdlib, for some reason—and I've literally never seen anyone use the `private` pseudo-keyword in the Java-esque way it's used here (`private def foo...` on the same line), to the point that I didn't even realize that that was possible. I've always only seen these usages: • `private` on its own line with surrounding whitespace, treated as a section-break in the class, where it has a "mode-switch for all that follows" effect similar to `private:` in C++. • `private :foo` on a separate line after `def foo...`, where it's just acting as a standalone call to one of Class's "builder" DSL methods, like an `attr_reader` call. • `private\ndef foo` (rare), as if `private` were some Java-like annotation modifying just the following method (though this is really just the first mode-switching kind, and later methods will need a `public\n` "annotation" to go back.) Why is that? It seems startlingly obvious, once you see it done, that `private def ...` is the idiomatic way to use it. (After all, they bothered to make `def` return the symbolic name of the function you defined, just so you could chain it into class-builder-methods like this.)

abhorrence 6y ago
def returning the method name as a symbol wasn’t added until ruby 2.1, and doesn’t seem to have been compelling enough to cause people to change their ways.
dragonwriter 6y ago
> It seems startlingly obvious, once you see it done, that `private def ...` is the idiomatic way to use it. As you note that almost no one does it in Ruby, it is not the idiomatic way in Ruby. Idioms change slowly, and this wasn't supported for most of Ruby history.