How to implement courses like codeschool?

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skowl2014-12-03 20:26:21

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skowl, 2014-12-03 20:26:21

Hello. I have been learning RoR for half a year, I want to do something similar to codeschool. A basic question arose, how is user interaction implemented in codeschool? Those. how to make the user write code and the server returns the result of the written "program". First of all, I'm interested in how this is done for {html, css}, ruby, js.
In which direction to dig?
Maybe there are similar open source projects?

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