Turn Computed Property into Lazy Property

struct Type {

  static var keys: [String] {
    print("Executed")
    return ["One", "Two"]
  }
}

Type.keys
Type.keys

Type.keys is a computed property and it is evaluated every time we call it. The Executed is printed twice to console. What I want is to turn it into a lazy static property. It is very simple, add = and (). Plus we should make it immutable by using let

struct Type {

  static let keys: [String] = {
    print("Executed")
    return ["One", "Two"]
  }()
}

Type.keys
Type.keys

We have increase Performance in few seconds and fixed side effects bugs

P.S
Copy-Past the code to the playground for easy testing