Custom Sorting an Array in Swift

custom-sorting-an-array-in-swift.swift

// https://hashaam.com/2017/07/20/custom-sorting-an-array-in-swift/

struct Business {
    let businessId: Int
    let rating: Int
}

func sortBusinesses(_ businesses: [Business]) -> [Business] {
    
    let set = NSOrderedSet(array: businesses)
    let newSet = set.sortedArray(comparator: { first, second -> ComparisonResult in
        let firstBusiness = first as! Business
        let secondBusiness = second as! Business
        if firstBusiness.rating == secondBusiness.rating {
            return .orderedSame
        }
        return .orderedDescending
    })
    return newSet as! [Business]
    
}

let sortedBusinesses = sortBusinesses(businesses)