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Replies that are other Swift is probably your best choice for standard purposes today. However, there are still planning to be times when it's helpful to have really fine grained control over factors, at which place a working knowledge of C and Objective-C you will be stood by in stead that is good. As an example, permit's state you implement a reddish-dark shrub in Swift combined with rest of your application. After profiling, you see that there's a great value deal of time being used in this matter, even with you' ve optimized it for the greatest of the power. Now, it could be worth re-implementing it in Objectivec: the screen exported to your Quick API is likely to be identical (usually if you're returning tuples, etcen you may subclass it in Swift to re-incorporate that functionality), and you'll be able to genuinely tighten down the rule to some degree that probably wouldn't be as simple in Fast. I do believe Greg Parker mentioned it best when he said that Objective-C would now be described as a form of ' Object Oriented Assembly' terminology. Not needed frequently, but important for all those tight scenarios (Objective C and Fast message passing is applied in natural assembly code).