Why do enums have computed properties but not stored properties in Swift?

Question

I am new to Swift and just came across this in the documentation:

Computed properties are provided by classes, structures, and enumerations. Stored

Answer 1

I use a small trick to store properties that are not accesible on initialization.

First, I create a class Future which will store the stored property in the future:

class Future {
  var value: T?
  init(value: T? = nil) {
      self.value = value
  }
}

Then I create my enum:

enum Sample {
  case Test(future: Future)
}

Instantiate:

let enumTest = Sample.Test(future: Future())

Later in the code:

switch enumTest {
  case let .Test(future):
  future.value = "Foo"
}

And later on, you can access the value:

switch enumTest {
  case let .Test(future):
  // it will print Optional("Foo")
  print("\(future.value)")
}

This is not something you should abuse, but it can be helpful in some cases.

Hope it helps.