Extensions for URL that allows to check if a specific extension matches the allowed ones using reduce

HowToUseIt.swift

guard sourceUrl.matches([".dat", ".csv"]) else {
  print("Extension not allowed!")
}

// do your stuff here

URLExtensions.swift

import Foundation

extension URL {
  func matches(_ allowedExtensions: [String]) -> Bool {
    if lastPathComponent.isEmpty {
      return false
    }
        
    let result = allowedExtensions.reduce(false, { result, allowedExtension in
      let result = result || lastPathComponent.hasSuffix(allowedExtension)
        return result
      })        
      return result
  }
}