Day 9: 100 Days of SwiftUI

Closures, passing functions into functions, and checkpoint 5

https://www.hackingwithswift.com/100/swiftui/9

Closures

You can copy functions in Swift, and they work the same as the original except they lose their external parameter names.

func greetUser() {
    print("Hi there!")
}

greetUser()

var greetCopy = greetUser
greetCopy()

All functions have types. This includes the parameters they receive along with their return type, which might be Void.

func getUserData(for id: Int) -> String {
    if id == 1989 {
        return "Taylor Swift"
    } else { …

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