How to Use Computed Properties

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

struct Rectangle {
    var width: Double
    var height: Double
    var area: Double {
        width * height
    }
}

let rect = Rectangle(width: 4, height: 3)
print(rect.area)

Notes

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