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If you are correct, it should be the attribute get method in Objective-C.
Actually, @Tr2e was almost completely correct. His answer could have been improved with a slight modification:

lazy var orders: [AnyObject] = []

NO:

// 如果省略 `:` 后面的類型的話，orders 的類型會變?yōu)?NSArray，
// 而不是 Swift 的類型，也不是 NSMutableArray
lazy var orders = []

(PS: orders is a better name)

lazy var orderArray = NSMutableArray()

Single case?
If hard translation

func orderArray()->NSMutableArray{
    if _orderArray != nil {
        _orderArray = NSMutableArray.array()
    }
    return _orderArray
}

Swift point

// 單例類
class SharedObject {    
    static let sharedInstance = SharedObject()
}
// 使用 
SharedObject.sharedInstance.doSomething()   

There is a keyword called lazy, which is roughly like this:
lazy var array = { let a = NSArray.init(); return a }()