Swift Interview Questions and Answers in 2024

Swift is primarily used for developing applications across Apple's ecosystem including iOS, macOS, watchOS, and tvOS. It's a versatile programming language for creating a wide range of applications, from mobile apps to desktop software.

'let' is used to declare constants, which means the value assigned to it cannot be changed once set. 'var', on the other hand, is used to declare variables, allowing their values to be changed after the assignment.

Single-line comments are written using //, while multi-line comments are enclosed within /* */.

Type inference is a feature where the Swift compiler automatically determines the data type of a variable or constant based on its initial value. This reduces the need to explicitly specify types.

'print' is used to output variables and messages to the console for debugging purposes. 'debugPrint' offers similar functionality but provides additional debugging information like quotes around strings and escape characters.

'if let' unwraps an optional value within a conditional block and executes the block if the unwrapping is successful. 'guard' also unwraps optionals, but it's used within functions to exit early if unwrapping fails.

let addition = 5 + 3 let subtraction = 10 - 4 let multiplication = 6 * 2 let division = 12 / 3.

A tuple is a group of multiple values of different or the same types combined into a single compound value.

Example:

let person = ("John", 30)

Swift's fundamental data types include Int, Float, Double, Bool, String, and Character.

Swift uses Automatic Reference Counting (ARC) to manage memory. ARC tracks and manages references to objects, automatically deallocating objects when they're no longer needed.