Remove duplicated in a Struct Array

Question

I am filtering an array that can have a value where there are multiple Models of the same name, only they have different model numbers.

Variables

var modelArray = [model]()

Struct

struct model {
    var modelName = String();
    var modelNumber = String();
    var manufacturer = String();
    var phiTypeCode = String();
    var phiTypeDesc = String();
}

Filter

var filteredArray = self.modelArray.filter { $0.manufacturer.range(of: manufacturerVar, options: .caseInsensitive) != nil }

This produces the correct filtered Array, only due to the possibility of similar models with different model numbers, I am trying to remove duplicates from filteredArray. Fairly new to swift I don't have a great deal of experience making the struct hashable to be able to use the suggested solutions.

Hopefully this is more clear

Answer 1

First off, I tried making a sample in my PlayGround.

1. Conform your model model to the protocal Equatable, like so:

   struct Car: Equatable {
   
       var modelName = String()
       var manufacturer = String()
   
       init(modelName: String, manufacturer: String) {
           self.modelName = modelName
           self.manufacturer = manufacturer
       }
   
       static func == (lhs: Car, rhs: Car) -> Bool {
           return lhs.modelName == rhs.modelName
       }
   }
   

In the code above, we're assuming that the modelName is the primary key of your model.

2. Now make a function that enumerates your data source and returns a new data source after checking the element one by one, like so:

   // returns unique array
   
   func unique(cars: [Car]) -> [Car] {
   
       var uniqueCars = [Car]()
   
       for car in cars {
           if !uniqueCars.contains(car) {
               uniqueCars.append(car)
           }
       }
   
       return uniqueCars
   }
   

Finally, you now have the function to generate a new unique data source.

Example:

// Variable

var cars = [Car]()

// Adding data models to data source

let car1 = Car(modelName: "Kia Picanto", manufacturer: "Kia")
let car2 = Car(modelName: "Honda XX", manufacturer: "Honda")
let car3 = Car(modelName: "Honda XX", manufacturer: "Honda")

cars.append(car1)
cars.append(car2)
cars.append(car3)

// Now contains only two elements.
let uniqueCars = unique(cars: cars)