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I have learnt java. I can write in C/C++. Recently i have been developing web applications in java. I was planning to learn ruby. Are there any prerequisites for ruby that i don’t have.
In terms of knowledge? No, not really. You’ll just need to be prepared for when Ruby does things differently to C-type languages. You’ll probably find your workflow changes too – Ruby doesn’t have a compile stepº
What do you want to do?
If you’re using Linux or OSX (and you probably should be), you should use RVM to keep things tidy, and using Bundler with your projects will protect you from gem versioning hell on any platform.
º Technically, it could, but none of the major distributions compile Ruby to anything…