SwiftUI code snippet test

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Structures and Enumerations Are Value Types

Code snippet can be found in Official Swift docs.

A value type is a type whose value is copied when it’s assigned to a variable or constant, or when it’s passed to a function.

You’ve actually been using value types extensively throughout the previous chapters. In fact, all of the basic types in Swift — integers, floating-point numbers, Booleans, strings, arrays and dictionaries — are value types, and are implemented as structures behind the scenes.

All structures and enumerations are value types in Swift. This means that any structure and enumeration instances you create — and any value types they have as properties — are always copied when they’re passed around in your code.

enum CompassPoint {
    case north, south, east, west
    mutating func turnNorth() {
        self = .north
    }
}
var currentDirection = CompassPoint.west
let rememberedDirection = currentDirection
currentDirection.turnNorth()


print("The current direction is \(currentDirection)")
print("The remembered direction is \(rememberedDirection)")
// Prints "The current direction is north"
// Prints "The remembered direction is west"