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Re:Go and Swift take another step up the programming languag... by jeorgun on Thursday December 04, 2014 @04:57PM (#8701930)
None of the languages you listed have Objective-C interoperability, which is pretty crucial for their purposes.
Re:Go and Swift take another step up the programming languag... by bigtunacan on Thursday December 04, 2014 @07:31PM (#8702519)
RubyMotion is compiled, benchmarks similarly to Objective-C, is interoperable and already running in production apps for both iOS and Mac OSX.

Laurent Sansonetti also has extensive history with Apple.