Thanks to @Elchie I learned about Try Ruby! - a web based Ruby interpreter. An Applet based web version of a language isn't all that new. But, what's done quite well is the tutorial.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYE3isvl9-SaMbyif-3DYitGf6LKuzEr8tkMaqD6tY3bwIcazr5V5sk3wMZoMlpJPGKvBWtJ7ppMCOPsH8_i-syh2y6GxyJ3zfy50ZTPXzrOOWZetYOfMZTulffmZZFlB9yAS_rQ/s400/try-ruby.jpg)
The interpreter and tutorial are linked together, so as you try out the examples, the next step in the tutorial is shown. No more scanning past the examples - it only works if you try them out.
Even if you aren't interested in learning Ruby this is still a user an impressive user experience and one worth checking out.
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