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Test: Swift - Variables and Constants
1. You want to enforce name of a product be not changed once it’s assigned. How do you declare productName?
Results Congratulations! Correct Answer. You Answered: None. If you took the test, your answer will show up here. Correct Answer: let productName = “Processor X”; let productName: String; productName = “Processor X”; Explanation In Swift, a constant is declared with let. Option B says productName is constant and assigns an initial value of “Processor X”. The value of productName cannot be changed from that point onwards.
Option C is also valid. You can put multiple statements on one line if they are separated by a semi-colon (;). In this option, first the productName is declared as a constant String, then in the next statement a value is assigned.Take the Test Take the complete test on this topic. You will be able to review answers to questions and get a test score.
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Test is Based on this Article
This article talks about variables and constants and how Swift forces you to choose var (a variable) or let (a constant) right at the time of declaration.
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Test on variables (var) and constants (let) in Swift
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