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3 min readFeb 7, 2026
Swift

How to Add Methods with Extensions

Extend existing types without subclassing.

Steps

  1. Paste the code into a Swift file or playground.
  2. Run it once to verify the output.
  3. Adjust the inputs to match your use case.

Copy and paste

import Foundation

extension String {
    func reversedWords() -> String {
        return self.split(separator: " ").reversed().joined(separator: " ")
    }
}

let text = "Swift is fast"
print(text.reversedWords())

Notes

  • Keep functions small and focused for reuse.
  • Prefer safe APIs like optionals and guards.