Which of these three lines compile? Pick all… - Swift | Daily iOS

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SwiftMeesho

Optionals and IUOs

Which of these three lines compile? Pick all that apply.

let a: String = nil
let b: String? = nil
let c: String! = nil

Pick all that apply

SwiftShort answerIntro
Why does Swift have optionals?
#optional #nil
SwiftShort answerIntro
Your team's code review rules include "no force unwrapping (!)." Why have a rule like tha…
#optional #iuo
SwiftMultiple choiceIntro
Which of these unwrap an optional safely? Pick all that apply.
#optional
SwiftMultiple choiceIntro
Given let view: UIView = UILabel(), which of these casts can crash at runtime?
#optional