Uplift iOS Interview
The Guide is for YOU if
- You are preparing for an iOS interview and want to improve your skills and knowledge and looking to level up your interview game and land your dream job.
- You want to gain confidence and ease during iOS interviews by learning expert tips and curated strategies.
- You want access to a comprehensive list of iOS interview QA to practice and prepare.
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)
✍️ Written by Ishtiak Ahmed
👉 Follow me on X ● LinkedIn
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