Sorting NSArray containing NSDate objects

Question

I have an array containing NSDate objects. With Objective-C, I am able to sort this array by using:

NSArray *array = [unsortedArray sortedArrayU         


        

Answer 1

You can make your NSDate conform to protocol Comparable and then you can just compare it the same way you do with number data type:

extension NSDate: Comparable {}

public func <(lhs: NSDate, rhs: NSDate) -> Bool {
    return lhs.compare(rhs) == .OrderedAscending
}

var dates = [NSDate(),NSDate(timeIntervalSinceNow: -600)]   // ["Dec 28, 2015, 2:48 AM", "Dec 28, 2015, 2:38 AM"]
dates.sortInPlace(<)
dates // ["Dec 28, 2015, 2:38 AM", "Dec 28, 2015, 2:48 AM"]