What do you understand about optionals in ios Swift? What is the probl

1.	What do you understand about optionals in ios Swift? What is the problem which they solve?
Answer» An optional, in ios Swift, allows any type of variable to reflect a lack of value. The absence of value in Objective C is only available in reference types that use the nil special value. This is not possible with value types like int or float. With optionals, ios Swift EXTENDS the absence of value ideas to both reference and value types. An optional variable can be set to either a value or nil, which indicates that it has no value. An EXAMPLE of an optional is GIVEN below: var text: String?text = "I will GO to school."print(text)

What do you understand about optionals in ios Swift? What is the problem which they solve?

Answer»

An optional, in ios Swift, allows any type of variable to reflect a lack of value. The absence of value in Objective C is only available in reference types that use the nil special value. This is not possible with value types like int or float.

With optionals, ios Swift EXTENDS the absence of value ideas to both reference and value types. An optional variable can be set to either a value or nil, which indicates that it has no value. An EXAMPLE of an optional is GIVEN below:

var text: String?text = "I will GO to school."print(text)

Discussion

No Comment Found

Related InterviewSolutions

What do you understand about Grand Central Dispatch (GDC)?
What is a Swift module?
What are the several methods for unwrapping an optional in Swift?
State your understanding of core data.
In Swift, how would you describe a circular reference? What are your options for resolving it?
What are a few scenarios in which we can't avoid using implicitly unwrapped optionals and why so?
What do you understand about optionals in ios Swift? What is the problem which they solve?
What do you understand about generics in ios Swift?
What is the meaning of a GUARD statement? What are the advantages of using Swift's GUARD statement?
How can the double question mark symbol "??" be used in ios Swift programming?