Swift Programming Interview Questions and Answers

Swift is Apple’s new language option for programming native iOS applications. Swift is an amazing programming language that has been built from the ground up to be efficient and safe. It uses the same APIs that Objective-C does. Or, what you can do in Objective-C, you can do in Swift. Swift is a general-purpose (or) compiled programming language developed by Apple Inc. for iOS, macOS, watchOS, tvOS, and Linux. Swift is designed to work with Apple’s Cocoa and Cocoa Touch frameworks and the large body of existing Objective-C (ObjC) code written for Apple products. It is built with the open source LLVM compiler framework and has been included in Xcode since version 6. On platforms other than Linux, it uses the Objective-C runtime library which allows C, Objective-C, C++ and Swift code to run within one program.

Swift is friendly to new programmers. It’s an industrial-quality programming language that’s as expressive and enjoyable as a scripting language. Writing Swift code in a playground lets you experiment with code and see the results immediately, without the overhead of building and running an app.

Swift defines away large classes of common programming errors by adopting modern programming patterns:

Memory is managed automatically.

Variables are always initialized before use.

Array indices are checked for out-of-bounds errors.

Integers are checked for overflow.

Optional ensure that nil values are handled explicitly.

Error handling allows controlled recovery from unexpected failures.

Swift some main versions and also sub versions are released:

  • Swift was introduced at Apple’s 2014 Worldwide Developers Conference (WWDC).
  • Swift 1.1 was released on October 22, 2014
  • Swift 1.2 was released on April 8, 2015
  • Swift 2.0 was released on September 21, 2015
  • Swift 3.0 was released on September 13, 2016
  • Swift 4.0 was released on September 19, 2017
  • Current version is Swift 4.1.2 was released on May 31.2018

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