How to Write a Generic Function

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

func swapTwoValues<T>(_ a: inout T, _ b: inout T) {
    let temp = a
    a = b
    b = temp
}

var first = "A"
var second = "B"
swapTwoValues(&first, &second)

Notes

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