ln Apple Swift, which of the following references should be used when it is known that the reference will never be nil during its lifetime?

In Apple Swift, which of the following symbols is used to write an implicitly unwrapped optional?

In Apple Swift, a class:

What will be the output of the given Apple Swift code? var nm = 5.0 class abc[ var x = 0.0 var y: String [ return '\(nm)' ]

Output? class a1 { func cn10 { for var a = 9; a >=1; --a { for var b = 9; b >= 0; --b{ if b%2==a/2 [ print((b%4),terminator: "“) } } print("") }}} lets = a1() s.cn1()

In Swift, which of the following collection types is/are implemented as (a) generic collection(s)? 0 Array

How do you designated a failable initializer?

How would you call a function that throws errors and also returns a value?

What is the inferred type of x? let x = ["a", "b", "c"]

Which object allows you access to specify that a block of code runs in a background thread?

What must a convenience initializer call?