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copied!<p>Ruby 1.9 (YARV) gives us a good idea as to where ruby is headed, but I wouldn't recommend using it for production use. While it's certainly much faster than 1.8, even some parts of the syntax keep changing, so I don't think you could call it stable. It does have some interesting new features and syntax which will surely find their way into all the other implementations over time.</p> <p>JRuby and IronRuby are useful in that they give ruby access to a whole range of new libraries and environments where ruby couldn't be used otherwise. I've not found much use for them myself yet, but think it's great that they exist. They may allow ruby to infiltrate corporate environments where it wouldn't otherwise be permitted. That can only be a good thing.</p> <p>Rubinius and Maglev are probably the most interesting projects, but also those where their benefit to the community is likely to be furthest into the future. Rubinius may well develop into a cutting edge 'pure' VM for the ruby language, allowing ruby code to run much faster than it can now. Maglev too seems extremely promising, backed as it is by 20+ years of VM experience. It will also provide features over and beyond a standard VM, but of course these will come at the cost of code portability.</p> <p>Overall though, what I'm most excited about is the competition between these implementations. Having competing projects all working to make ruby better can only make the ruby ecosystem stronger. From what I've seen too, while the competition exists it is friendly; each project giving and taking ideas from each other. The work done by the JRuby and Rubinius teams in creating a ruby spec is probably the most important outcome so far, as it will help ensure that all implementations remain compatible.</p>

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