Swift: Sorting Objects by Function Value

Question

I'm trying to sort an array of objects by the return value of one of their functions/methods. My class is as below:

class Shift{
var Name: String

var Deliveries: [Delivery] = []
var SalesPercentage: Double = 0.0
var LabelForecast: Double = 0.0
var PromotionModsChanging: Double = 0.0

var ShortName: String{
    get{
        return Name[0...2]
    }
}

init(Name: String){
    self.Name = Name
}

func getSales() -> Double{
    return (SalesPercentage / 100) * Settings.ExpectedWeeklySales
}

func totalWeight() -> Double{
    var total: Double = 0.0

    // Add total Deliveries Weight
    for delivery: Delivery in Deliveries{
        total = total + delivery.DeliveryWeight()
    }

    // Add Sales Weight
    total = total + (getSales() * 0.2)

    // Add labels Weight measured at 100 labels per hour
    total = total + (LabelForecast * 0.6)

    // Add Promotion Mods Changing measured at 45 Minutes per mod. Ladder racks and grocery shelving should be classed as 0.5 mods each.
    total = total + (PromotionModsChanging * 45)

    return total
}


}

The array that they are stored in is as:

var Shifts: [Shift] = []

Which I've then appended Shift objects to. Then I am trying to find a way to organise the Shifts array by the returned value from the totalWeight() function. Can anyone help?

ABakerSmith · Accepted Answer · 2015-05-10 17:57:25Z

1

The following would sort the array of Shifts into ascending order:

let sorted = shifts.sorted { $0.totalWeight() < $1.totalWeight() }

Alternatively, instead of creating a new array and assigning the sorted shifts to that; you could sort shifts like so:

shifts.sort { $0.totalWeight() < $1.totalWeight() }

Bear in mind, the immediately above code will only work because you've declared shifts as variable.

edited May 10, 2015 at 17:57

answered May 10, 2015 at 17:48

ABakerSmith

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1 Comment

Alex Bailey Over a year ago

Can't believe it. Tried it already but had a syntax error so wouldn't work. Cheers bro

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