Wrapped nima?

wrapped - bu, muvaffaqiyatli chiqarilgan (unwrapping)dan keyin opsional turining qiymati. Optional<<Wrapped>> opsionalida yoki Wrapped turidagi qiymat yoki nil bo'lishi mumkin. Chiqarish Wrapped qiymatiga kirish imkonini beradi, agar u mavjud bo'lsa.

Chiqarish misollari:

1. Majburiy chiqarish (Force unwrapping) !:

   var optionalString: String? = "Hello"
   let unwrappedString = optionalString! // "Hello" qiymatini oladi
   // Agar optionalString == nil bo'lsa, xato yuz beradi
   

2. Opsional bog'lash (Optional binding) if let yoki guard let:

   var anotherOptionalString: String? = "World"
   if let guaranteedString = anotherOptionalString {
       // Bu blok ichida, guaranteedString String turida (unwrapped)
       print(guaranteedString)
   }
   

3. Opsional zanjiri (Optional chaining) ?:

   class MyClass { var property: String? }
   var instance: MyClass? = MyClass()
   instance?.property = "Value" // Agar instance nil bo'lmasa, xususiyat o'rnatiladi
   let retrievedValue = instance?.property // retrievedValue String?
   

4. Nil bilan birlashish operatori (Nil-coalescing operator) ??:

   var yetAnotherOptionalString: String? = nil
   let defaultValue = yetAnotherOptionalString ?? "Default" // defaultValue "Default" bo'ladi
   // Agar yetAnotherOptionalString qiymatga ega bo'lsa, u ishlatiladi
   

Swift kontekstida, wrapped qiymat to'g'ridan-to'g'ri, opsional ichida bo'lgan qiymatdir, undan oldin uni ishlashdan oldin.