What is a lazy stored property?

• Used to defer expensive computation until property is used for the first time.
• Must always be declared as a var as its initial value might not be set until after initialisation completes.
• Add the lazy key word in front of the var keyword.
• : Type followed by closure syntax.
• () on the end of the closure.
• Stored properties and lazy stored properties cannot be defined in an extension.

lazy var something: Int {
  // Carry out some expensive computation

  return result
}()

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