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3 min readJan 16, 2026
Swift

How to Use Variables and Constants

Prefer constants with let and fall back to var only when needed.

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

let maxAttempts = 3
var currentAttempt = 1

currentAttempt += 1
print("Attempt", currentAttempt, "of", maxAttempts)

Notes

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