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This fear of learning a new tool, language or API boggles my mind.

The insight alone from seeing a new corner of the programming world is worth biting the bullet and learning something new.

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I think your comment is great, and equally applies to experienced Objective-C developers who could miss something interesting here :)

Good point, although, an experienced Objective-C developer can already write iOS apps - learning Ruby in the context of backend development would probably be more beneficial. It'd be like asking Michael Jordan to play basketball left-handed instead of playing baseball.

Former .Net/Java developers were already able to write backend apps before Rails started growing, yet there was a fairly large exodus at some point.

Similarly, I'm making the quick bet that we will see a interesting number of experienced Obj-C developers move to RubyMotion! (well, as someone who is on the RubyMotion list, I can tell some have already started).

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