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Test: Swift - Introduction to Optionals

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



Results
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;
Explanation
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”).
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Question 1 of 5


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

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Summary of three operators (?, !, ??) used in optionals in Swift.
                                                                                                                                                                                                             
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