// Articles. Tutorials. Utilities.
Home  |   Search  |   Login  
Categories Skip Navigation Links
New / All
Google / Android
Python / IronPython
SQL Server
Test: Swift - Introduction to Optionals

1. What can a variable declared as Optional in Swift hold?

Congratulations! Correct Answer.
You Answered: None. If you took the test, your answer will show up here.
Correct Answer: A no-value; Any value of the specific type used in its declaration;
An Optional in Swift can hold a state of no-value (i.e. absence of a value) or some specific value of that particular type. For example, var name: String? declaration can have nil as its value or some string value (like “John”).
Take the Test
Take the complete test on this topic. You will be able to review answers to questions and get a test score.

Take the Test

Question 1 of 5

Test is Based on this Article
Tags: optionals, swift
This article talks about the purpose of Optionals in Swift and how to declare them in your code.
Tags: optionals, swift
This is a test on basic concepts of Optionals in Swift.

More Articles With Similar Tags
This article talks about unwrapping the optionals in Swift implicitly and the circumstances where you would use this functionality.
This article discusses the safer ways of unwrapping an optional in Swift that includes Optional Binding.
This article talks about the Nil Coalescing Operator (??) in Swift.
This article talks about optional chaining in swift where multiple optionals can be chained together and fail gracefully by returning nil when one of them is nil.
Summary of three operators (?, !, ??) used in optionals in Swift.
About  Contact  Privacy Policy  Site Map