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A variadic parameter accepts zero or more values of a specified type. When creating API it seems more developer-friendly as we don’t needs to generate an array at the caller site in order to pass multiple arguments.
The variadic parameter using three dots can be passed a varying number of input values when the function is called.
KEY TAKEWAYS
The values passed to a variadic parameter are made available within the function’s body as an array of the appropriate type.
// Variadic parameter can be used any number of arguments(here voucherValues) func redeemVouchers(_ greetings: String, voucherValues: Int...) -> String { let voucherText = voucherValues.count > 0 ? " You have redeemed " + "\(voucherValues.reduce(0, +)) €" : "" return greetings + voucherText } // No variadic parameter redeemVouchers("Congratulation!") // "Congratulation!" // Multiple variadic parameter redeemVouchers("Congratulation!", voucherValues: 12, 23, 10) // "Congratulation! You have redeemed 45 €" // Single variadic parameter redeemVouchers("Congratulation!", voucherValues: 10) // "Congratulation! You have redeemed 10 €"
Recently released Swift 5.4 brings support for multiple variadic parameters. However, you can not use variadic parameters as inout parameters.
func redeemVouchers(_ greetings: String..., voucherValues: String...) { ... } redeemVouchers("Congratulation!" "Mr. Robot", voucherValues: 12, 23, 10)
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- Uplift iOS Interview - A Comprehensive Guide to iOS Interview
- Xcode Cheat Sheet for Swift
- Xcode Cheat Sheet for SwiftUI
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