Comprehensive changelog of Ruby Programming Language https://rubyreferences.github.io/rubychanges/ <p><strong>Highlights:</strong></p> <p><em>Note: As Ruby doesn’t follow SemVer, the 4.0 version marks not some significant change/set of changes, but was chosen by Matz to celebrate Ruby’s 30s birthday.</em></p> <ul> <li>Support for line breaks before logical operators</li> <li><code>Set</code> reimplemented efficiently</li> <li><code>Pathname</code> became a core class</li> <li><code>Ruby::Box</code></li> <li><code>Ractor</code>: ports</li> </ul> <p><a href="https://rubyreferences.github.io/rubychanges/4.0.html">Read more »</a></p> Fri, 26 Dec 2025 00:00:00 +0000 https://rubyreferences.github.io/rubychanges//4.0.html https://rubyreferences.github.io/rubychanges//4.0.html <p><strong>Highlights:</strong></p> <ul> <li><code>it</code> will become anonymous block argument in 3.4</li> <li><code>Module#set_temporary_name</code></li> <li><code>ObjectSpace::WeakKeyMap</code></li> <li><code>Range#overlap?</code></li> <li><code>Fiber#kill</code></li> </ul> <p><a href="https://rubyreferences.github.io/rubychanges/3.3.html">Read more »</a></p> Mon, 25 Dec 2023 00:00:00 +0000 https://rubyreferences.github.io/rubychanges//3.3.html https://rubyreferences.github.io/rubychanges//3.3.html <p><strong>Highlights:</strong></p> <ul> <li><code>it</code> anonymous block argument</li> <li><code>**nil</code> unpacking</li> <li>String literals would be frozen in Ruby 3.5</li> <li><code>Range#step</code> iteration for any class via <code>+</code></li> <li>Backtrace improvements</li> <li>Ractor improvements</li> <li>Serious implementation updates</li> </ul> <p><a href="https://rubyreferences.github.io/rubychanges/3.4.html">Read more »</a></p> Mon, 25 Dec 2023 00:00:00 +0000 https://rubyreferences.github.io/rubychanges//3.4.html https://rubyreferences.github.io/rubychanges//3.4.html <p><strong>Highlights:</strong></p> <ul> <li>Anonymous method argument passing</li> <li>More inspectable refinements</li> <li><code>Data</code> class</li> <li>Support for pattern-matching in <code>Time</code> and <code>MatchData</code></li> <li><code>Set</code> is a built-in class</li> <li>Per-<code>Fiber</code> storage</li> <li><code>RubyVM::AbstractSyntaxTree</code>: fault-tolerant and token-level parsing</li> </ul> <p><a href="https://rubyreferences.github.io/rubychanges/3.2.html">Read more »</a></p> Fri, 04 Feb 2022 00:00:00 +0000 https://rubyreferences.github.io/rubychanges//3.2.html https://rubyreferences.github.io/rubychanges//3.2.html <p><strong>Highlights:</strong></p> <p>The first major release after 3.0, Ruby 3.1 mostly dedicated to stabilizing new features like concurrency and pattern-matching, but also introduces a bunch of new features.</p> <ul> <li>Hash literal value omission</li> <li>Anonymous block argument</li> <li>Pattern-matching: pinning of expressions</li> <li><code>Time</code>: better support for timezones in construction</li> <li>Low-level <code>IO::Buffer</code></li> <li>More methods become async with fiber scheduler</li> </ul> <p><em><strong>See also my this year’s ongoing post series on the making of the changelog and Ruby development process.</strong></em></p> <p><a href="https://rubyreferences.github.io/rubychanges/3.1.html">Read more »</a></p> Wed, 05 Jan 2022 00:00:00 +0000 https://rubyreferences.github.io/rubychanges//3.1.html https://rubyreferences.github.io/rubychanges//3.1.html <p><strong>Highlights:</strong></p> <p>Ruby 3.0 is a major language release. The core team worked hard to preserve backward compatibility while delivering some huge and exciting new features.</p> <ul> <li>Full separation of keyword arguments</li> <li>Ractors: Thread-alike object implementing the actor model, and finally lifting the GVL (Global Virtual machine Lock) and enabling true concurrency</li> <li>Non-blocking IO with Fibers</li> <li>Type declarations (in separate files)</li> <li>Pattern matching: <ul> <li>No longer experimental</li> <li>Two flavors for one-line pattern matching: <code>=&gt;</code> (aka rightward assignment) and <code>in</code> (aka boolean check)</li> <li>Find patterns</li> </ul> </li> <li>“Endless” methods</li> <li>GC auto-compaction</li> </ul> <p><a href="https://rubyreferences.github.io/rubychanges/3.0.html">Read more »</a></p> Fri, 25 Dec 2020 00:00:00 +0000 https://rubyreferences.github.io/rubychanges//3.0.html https://rubyreferences.github.io/rubychanges//3.0.html <p><strong>Highlights:</strong></p> <p>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). Be prepared!</p> <ul> <li>Pattern matching</li> <li>“Real” keyword argument</li> <li>Numbered block parameters</li> <li>Beginless range</li> <li><code>Enumerator.produce</code></li> <li><code>GC.compact</code></li> <li>Large update of IRB</li> <li>Serious cleanup of the standard library</li> </ul> <p><small>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.</small></p> <p><a href="https://rubyreferences.github.io/rubychanges/2.7.html">Read more »</a></p> Fri, 27 Dec 2019 00:00:00 +0000 https://rubyreferences.github.io/rubychanges//2.7.html https://rubyreferences.github.io/rubychanges//2.7.html <p><strong>Highlights:</strong></p> <ul> <li>Toplevel <code>return</code></li> <li>Unification of <code>Fixnum</code> and <code>Bignum</code> into <code>Integer</code></li> <li>Full Unicode support for String case operations</li> <li><code>Warning</code> module for fine-grained warnings output control</li> <li><code>Comparable#clamp</code></li> </ul> <p><a href="https://rubyreferences.github.io/rubychanges/2.4.html">Read more »</a></p> Mon, 14 Oct 2019 00:00:00 +0000 https://rubyreferences.github.io/rubychanges//2.4.html https://rubyreferences.github.io/rubychanges//2.4.html <p><strong>Highlights:</strong></p> <ul> <li><code>rescue</code>/<code>ensure</code> inside blocks</li> <li><code>#yield_self</code></li> <li><code>Struct</code> with keyword initialization</li> <li>Exceptions output changed</li> </ul> <p><a href="https://rubyreferences.github.io/rubychanges/2.5.html">Read more »</a></p> Thu, 06 Jun 2019 00:00:00 +0000 https://rubyreferences.github.io/rubychanges//2.5.html https://rubyreferences.github.io/rubychanges//2.5.html <p><strong>Highlights:</strong></p> <ul> <li>Endless range</li> <li><code>#then</code> “piping” method</li> <li>Support for timezones in <code>Time</code></li> <li><code>Proc</code> composition</li> <li>Enumerator chaining</li> <li><code>RubyVM::AbstractSyntaxTree</code></li> </ul> <p><a href="https://rubyreferences.github.io/rubychanges/2.6.html">Read more »</a></p> Sat, 29 Dec 2018 00:00:00 +0000 https://rubyreferences.github.io/rubychanges//2.6.html https://rubyreferences.github.io/rubychanges//2.6.html https://rubyreferences.github.io/rubychanges//evolution.html https://rubyreferences.github.io/rubychanges//evolution.html