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What variants of the language exist? How common are they?

April 26, 2017common exist Language variants

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What variants of the language exist? How common are they?

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By far the most popular and actively-developed variant of Objective-C is that maintained by Apple, based on the GNU C Compiler. The ‘vanilla’ GNU C Compiler from the Free Software Foundation also supports the language; its implementation is very similar to that provided by Apple although newer features take some time to trickle down, and the two runtimes are not compatible with each other. David Stes’ POC implementation is incompatible with the above two, and doesn’t contain many of the features of Apple’s Objective-C implementation. On the other hand, it does provide blocks (a Smalltalk feature, also found in Ruby) and class variables. POC is not considered further in this FAQ, due to its incompatibility with the popular Objective-C variants.