Performance

The official Apple website claims that Swift is 2.6 times faster than Objective-C. However some studies indicate that the difference is not as dramatic. Swift and Objective-C are both statistically typed languages that use the same iOS SDK and the high-quality Low Level Virtual Machine compiler. There are differences, however, that impact app performance and we’ll describe them below. 

Objective-C uses the runtime code compilation

Objective-C isn’t a fast language. The main reason is that it uses the runtime code compilation, rather than the compile time. This means that when the Objective-C object calls for another object in the code, there is an extra level of indirection involved. Generally, this happens very fast but when the code compilation happens a significant number of times, it becomes measurable. Objective-C is a superset of C and all C functions that you will write in Objective-C will be just as fast. Developers who write the performance-sensitive code often go back to clear C for those inner loops. 

Swift was made to be swift

Swift language is a good choice for performance-sensitive code. According to many tests, it shows the performance close to C++ for the FFT algorithms. Swift also outperforms C++ for the Mandelbrot algorithm. Because Swift is still a young language, we can expect even more enhancements soon. 

Safety

Swift was designed to improve the code safety for iOS products. It was created as a type-safe and memory-safe language. Type safety means that the language itself prevents type errors. The importance of type memory safety is that it helps avoid vulnerabilities associated with dangling or uninitialized pointers. These types of errors are the most common in development and difficult to find and debug. These advantages of the Swift language make it more attractive.

Swift was created for clean code

Swift, on the other hand, doesn’t use pointers. If you miss a pointer in the code, perhaps nil value, the app will crash. This approach allows programmers to find and fix bugs quickly. As a result, the code will be cleaner and easier to understand. Such features as generics, optionals, and type interference make an app developed in Swift less inclined to contain unnoticed bugs. 

Maintenance

Managing files in Objective-C is a frustrating process because developers must manage two separate files. While Swift requires less maintenance and doesn’t require you to manage two files. The thing is that Swift automatically completes the reliances and performs an incremental build in the file.