# Programming in Swift: Fundamentals

Oct 19 2021 Swift 5.5, iOS 15, Xcode 13

## Part 5: Functions & Named Types

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Update Notes: The student materials have been reviewed and are updated as of October 2021.

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If you followed along and built the Bullseye app, you might remember writing functions like `amountOff` or `sliderValueRounded`. Both of those methods returned a value. When a function or method returns a value, once the function is called that value can be stored or used in-place.

``````func amountOff() -> Int {
abs(target - sliderValueRounded())
}

func pointsForCurrentRound() -> Int {
let maximumScore = 100
let difference = amountOff()
let bonus: Int
if difference == 0 {
bonus = 100
} else if difference == 1 {....
``````
``````func sliderValueRounded() -> Int {
Int(sliderValue.rounded())
}

func amountOff() -> Int {
abs(target - sliderValueRounded())
}
``````
``````...) -> {...
``````
``````...) -> Bool {...
``````
``````  return grade >= lowestPass
``````
``````grade >= lowestPass
``````
``````func getPassStatus
``````
``````let chrisPassStatus = getPassStatus(for: chris.grade)
``````
``````let classPassStatus = getPassStatus(for: chris.grade) && getPassStatus(for: sam.grade)
``````
``````let sam = (name: "Sam", grade: 99, pet: nil)
``````
``````let sam: (name: String, grade: Int, pet: String?) = (name: "Sam", grade: 99, pet: nil)
``````
``````typealias Student =
``````
``````let chris: Student = (name: "Chris", grade: 49, pet: "Mango")
let sam: Student = (name: "Sam", grade: 99, pet: nil)
``````
``````func orderPetCollar(for student: Student) {

}
``````
``````guard let pet = student.pet
``````
``````guard let pet = student.pet else { }
``````
``````guard let pet = student.pet else { return }
``````
``````print("One custom collar for \(student.name)'s pet, \(pet)!")
``````
``````orderPetCollar(for: chris)
``````
``````orderPetCollar(for: sam)
``````