Lazy property initialization in Swift

Question

How would you implement the following pattern in Swift?

The Container class is initialized with a JSON array that contains dictionaries. These dictionar

Answer 1

Since the entries property is just an array of the values in entriesByNumber you can do all the loading just in entriesByNumber and just have entries depend on entriesByNumber

lazy var entriesByNumber: [String : Entry] = {
        var ret: [String : Entry] = [:] 
        for (number, entryDict) in entriesDict
        {
            ret[number] = Entry(dictionary: entryDict, container: self)
        }
        return ret
    }

var entries: [Entry] 
{
    get { return self.entriesByNumber.values }
}