What is difference between single and double ? in Swift?

devquora
devquora

Posted On: Feb 22, 2018

 

Difference between single and double ? in Swift:

Single ? in Swift is used to denote an optional value either contains a value or contains nil to indicate that the value is missing.

double ?? in swift is called nil coalescing operator that finds if optional has no value then it uses a default value.

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