Which is correct regarding optional form of the type cast operator (as?)?

How could one declare a Swift Array type that can store any type of class object?

How could we cast the following array into an NSArray that accesses the NSArray method:

What set of keywords is most commonly used to iterate over a collections of items?

How can we use optional binding to determine if the variable string is not nil?

Choose the answer that declares an optional closure.

During which stage memory is taken from stack or heap?

Deallocation never happens due to ___

What is the typical byte width of Float data type in Swift?

Weak references are declared as _____ types

unowned reference types are declared as __