This is a companion discussion topic for the original entry at https://www.raywenderlich.com/5994-programming-in-swift/lessons/31
This is a companion discussion topic for the original entry at https://www.raywenderlich.com/5994-programming-in-swift/lessons/31
Why would a dictionary give you nil and an array give you a fatal error for doing basically the same thing? Aren’t you asking for something “out of bounds” either way?
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That’s an excellent question!
…and it has been the source of much debate over at https://forums.swift.org. There’s no easy answer!
Is there a preferred method to creating an empty dictionary? I’m not sure which to use (and why) between the following:
var namesAndAges: [String : Int] = [:]
var anotherEmptyDictionary = String : String
Is one preferred over the other; are there any additional ways of creating empty dictionaries?
Looks like some of my code was removed. Here’s a snippet:
Dictionaries return optional values, arrays return non-optional values (usually). So the syntax of using them is typically different. If an array could return nil, we would have to constantly unwrap the values in it.
I think they are interchangeable, and compile to the same thing.
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