Ruby版本1.9.3与2.0.0

Question

I'm following Michael Hartl's Ruby tutorial book and the book says I should have Ruby 2.0.0 version. Since I have Ruby 1.9.3 version, I've tried various ways but it seems like I can't upgrade it to Ruby 2.0.0 version. Is it okay if I work code with Ruby 1.9.3 version and Rails 4.0.2?

Is it possible to have multiple Ruby or Rails versions within a computer? If so, how can that be achieved?

Thank you!

Answer 1

1. Take a look at: https://rvm.io/ Thanks to this tool you have ability to awesome things with ruby versions. To have multiple versions of RoR you can use: http://rvm.io/gemsets

2. Sure, RoR 4.x is fully compatible with Ruby 1.9.3

Answer 2

Yes, it is possible to use multiple versions of Ruby on one machine using RVM https://rvm.io/ . (alternatively, try rbenv https://github.com/sstephenson/rbenv ).

Perhaps you've installed 2.0.0 correctly with RVM, but you just aren't using the correct Ruby? Check RVM's setup with:

rvm current

That should output a string that begins with the version of Ruby that RVM is using. To change to using to 2.0.0 :

rvm use 2.0.0