Are objects of type Enum always stored on the stack memory?

Enum objects in Swift (and in other languages, such as C# or Java) are not always placed on the stack. The placement depends on the usage context and the size of the enum.

If the enum is small and used as a local variable, it is usually placed on the stack. However, if the enum contains associated values or is used as part of a class (which is allocated on the heap), then the enum may reside on the heap.

For example, in Swift:

enum Direction {
    case north
    case south
    case east
    case west
}

var dir = Direction.north // most likely on the stack

If the enum is used inside a class:

class Car {
    var direction: Direction
    init(direction: Direction) {
        self.direction = direction
    }
}

then the enum will be stored on the heap along with the class object.

Therefore, it cannot be definitively stated that enums are always placed on the stack.