At the same time, as the “official” security features, subtle bugs in implementation of $SAFE and tainting have caused lot of “vulnerability reports” and added maintenance burden.Ĭalling a private method with a literal self as the receiver is now allowed. $SAFE constant, trying to limit “unsafe” calls when set to higher values, is considered a fundamentally flawed method and documented so since Ruby 2.0. The concepts of marking objects as 'tainted' (unsafe, came from the outside) and “untaint” them after the check, is for a long time ignored by most of the libraries. “Safe” and “taint” concepts are deprecated in general Note: The BIG difference with “enumerator-based” filtering, which makes flip-flops useful in complicated data processing, is that enumerator’s can’t express multiple “ons and offs” (imagine file has several > blocks and try to solve the task without flip-flops).Require 'open-uri' require 'json' data = URI. As it is new and huge, we’ll not try to cover the feature here and just send the reader to the official documentation. Pattern matching is a completely new and experimental feature for structural value checking against patterns, and local variable binding. ¹There is a possibility 2.8 will also be released, but in any case, Christmas release of 2020 is promised to be Ruby 3.0. Serious cleanup of the standard library.

Ruby 2.7 is a last major release before 3.0¹, so it introduces several important changes, larger in scale than previous releases (and also a bit lean on a “just nice to have” features side). Last change to this document: Sep 20, 2023.This document first published: Dec 27, 2019.Libraries excluded from the standard library.resolve_feature_path behavior for loaded features fixed.File.extname returns a '.' string at a name ending with a dot.ObjectSpace::WeakMap#= now accepts non-GC-able objects.Refinements in #method/ #instance_method.“Safe” and “taint” concepts are deprecated in general.If you are not using homebrew I don't know what you are doing, and most probably you know what you are doing (but then, why are you here?). If you installed rbenv via homebrew you'll need to do brew upgrade which will also update your rbenv so that latest stable versions of Ruby should appear in your rbenv. (bonus) Check it's installed ~ rbenv versionsĪnd for the sake of completeness and inclusiveness, let's see how it's done on the other operating that exists in this world: rbenv install Ruby 3 on MacOS Upgrade the rbenv build ~ git -C ~/.rbenv/plugins/ruby-build pull With the missing information bit, we are now just 2 terminal commands away from victory.ġ. ~ # Here we go 👆 the crucial hint at the end of the output! The one moment when 'being aware' actually does something. If the version you need is missing, try upgrading ruby-build: The sad truth is that my brain was not able to parse the whole terminal output which already poses the solution: ~ rbenv install 3.0.0 So the investigation continued: Where's Ruby 3 in rbenv? 🤔 🔎 rbenv install Ruby 3 on Ubuntu

You will most probably encounter this issue when you have rbenv lying around for quite a while already. See all available versions with `rbenv install -list'.

Naive as I am, I fired up my terminal and gave it a spontaneous shot: ~ rbenv install 3.0.0

Ruby versions list