How can you make a property optional in Swift?

devquora
devquora

Posted On: Feb 22, 2018

 

An optional in Swift is a type that can hold either a value or no value. Optionals are written by appending a ? to any type:

Example

var name: String? = "Online Interview Questions"

Declaring a question mark "?" in the code can make a property optional.
If a property doesn’t hold a value, then this symbol "?" helps in avoiding the runtime errors.

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