Often we create custom classes like Person or Address and then need to compare if the two instances of this class or Objects are equal. With this Swift code example I would like to share with you how to compare two objects of a custom class you create by making a custom class conform to a Comparable protocol.

• Create a custom Swift class with a name “Friend”
• Make Friend class conform to a Comparable protocol
• Create two instances of a Friend class and compare them

Here is a short Swift code example which demonstrates how to implement a custom class in Swift and make it conform to a Comparable protocol.

Make Custom Class Conform to a Comparable Protocol Example in Swift

  
 import Foundation

class Friend : Comparable {
    let name : String
    let age : Int
    
    init(name : String, age: Int) {
        self.name = name
        self.age = age
    }
}

func < (lhs: Friend, rhs: Friend) -> Bool {
    return lhs.age < rhs.age } func > (lhs: Friend, rhs: Friend) -> Bool {
    return lhs.age > rhs.age
}

func == (lhs: Friend, rhs: Friend) -> Bool {
    var returnValue = false
    if (lhs.name == rhs.name) && (lhs.age == rhs.age)
    {
        returnValue = true
    }
    return returnValue
}

Compare Two Custom Objects that Implement Comparable Protocol

  

        let friend1 = Friend(name: "Sergey", age: 35)
        let friend2 = Friend(name: "Sergey", age: 30)
        
        print("\Compare Friend object. Same person? (friend1 == friend2)")  // false

Checkout more Swift code examples at Swift Code Examples page.

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