# Programming in Swift: Functions & Types

Jan 4 2022 Swift 5.5, iOS 15, Xcode 13

## Part 2: Closures

### Lesson Complete

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Update Notes: This course was originally recorded in 2019. It has been reviewed and all content and materials updated as of October 2021.

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I’ve got a quick challenge to help you practice writing closures. You’ll find it on page 3 of the Playground for this part of the course. Pause the video, give it a try, and then come back to go over some solutions. Have fun!

``````let fullName =
``````
``````let fullName = {

}
``````
``````let fullName = { 😺(firstName: String, lastName: String?) -> String🛑
}
``````
``````let fullName = { (firstName: String, lastName: String?) -> String 😺in
}
``````
``````  😺firstName + " " + (lastName ?? "")🛑
``````
``````let ozmaName = calculateFullName(firstName: "Ozma", lastName: "Catterwaul")
``````
``````let princeName = fullName("Prince", nil)
``````
``````printResult({ (<#Double#>, <#Double#>) -> Double in
<#code#>
}, <#T##a: Double##Double#>, <#T##b: Double##Double#>)
``````
``````printResult(
{ (😺a, b🛑) -> Double in
``````
``````    ((a * a) + (b * b)).squareRoot()
}
``````
``````printResult(
{ (a, b) -> Double in
((a * a) + (b * b)).squareRoot()
},
😺5, 3🛑
)
``````