Can Swift be considered a programming language with functional capabilities?

Yes, Swift can be considered a programming language with functional capabilities. It supports concepts such as higher-order functions, closures, immutable data structures (via let), currying, lazy evaluation, and pattern matching. Although Swift is not purely a functional language, it allows the use of functional programming styles, which improve code readability and safety.

Example of using closures and higher-order functions:

let numbers = [1, 2, 3, 4, 5]
let doubled = numbers.map { $0 * 2 }
print(doubled) // [2, 4, 6, 8, 10]