CODEWITHSUNDEEP
swiftswift2
tomtclai
tomtclai

Reputation: 333

Whats the difference between these two properties?

What's the difference between these two??

var sharedContextA: NSManagedObjectContext {
    return CoreDataStackManager.sharedInstantce().managedObjectContext
}


var sharedContextB = {
    return CoreDataStackManager.sharedInstantce().managedObjectContext
}()

To clarify, I have seen:

var variable: Type {
    code
    return X
}

but I don't know the name of this or how it is different than the former:

var variable = {
    code
    return X
}()

Upvotes: 0

Views: 73

Answers (1)

vadian
vadian

Reputation: 285059

sharedContextA is a computed property. The value to be returned is computed each time the getter of the property is called.

sharedContextB uses a closure to assign a default value to the property. The closure is executed once during initialization of the type the property belongs to, afterwards the stored value is read directly.

Upvotes: 1

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