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iOS Swift 2.0 Enumerations and Optionals Introduction to Optionals Initializing Optional Values

shane reichefeld
PLUS
shane reichefeld
Courses Plus Student 2,232 Points
Posted by shane reichefeld
shane reichefeld
Courses Plus Student 2,232 Points

Can someone help solve and explain what each line does?

Help? Also could someone explain with an example in what situation would be used in an actual iOS App

optionals.swift 
struct Book {
    let title: String
    let author: String
    let price: String?
    let pubDate: String?

}

1 Answer

Jhoan Arango
Jhoan Arango
14,575 Points
Jhoan Arango
Jhoan Arango
14,575 Points

Hello Shane :

That's a struct, and each line is not doing anything in particular. You are simply declaring properties of a struct. A struct is a blueprint that defines an object.

Here is an example of creating an object with the struct named "Book".

struct Book {
    let title: String
    let author: String
    let price: String?
    let pubDate: String?
}


let myBook = Book(title: "My First Book", author: "Shane", price: "45.00", pubDate: "10/10/16")

// Then you can access these properties with the dot notation. 


myBook.title // Will return "My First Book"


// or you can also print 

print(myBook.author) // will print "Shane"

I recommend starting from swift basics, and moving on to Swift Objective Oriented Program. It will explain everything about objects and how to work with them .

Good luck