Selgitage esimese klassi funktsioonide kontseptsiooni Swift keeles ja nende rolli programmeerimises.

In Swift, functions are first-class objects, which means that functions can:

• Be assigned to variables and constants
• Be passed as arguments to other functions
• Be returned from functions
• Be stored in collections

This allows creating more flexible and expressive code, for example, using closures for event handling or behavior configuration.

Example:

func greet(name: String) -> String {
    return "Hello, \(name)!"
}

let greeter: (String) -> String = greet
print(greeter("Alice")) // Will print: Hello, Alice!

First-class functions facilitate functional programming style, enable high-level abstractions, and simplify working with asynchronous code.