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

dhari alaradah
dhari alaradah
3,127 Points
Posted by dhari alaradah
dhari alaradah
3,127 Points

help me please

i can not solve it

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

}