Customize the console printing of object types in swift

CustomPrintable.swift

import UIKit

// The protocol use to convert your instance into textual pretty form
protocol CustomPrintable: CustomStringConvertible {
    var emoji: String { get }
}

// Defaults
extension CustomPrintable {
    
    var emoji: String {
        return "📝"
    }
    
    var description: String {
        
        var desc: String = "\(type(of: self)) \(emoji)\n"
        let object = Mirror(reflecting: self)
        
        for property in object.children {
            guard let propertyName = property.label else {
                continue
            }
            desc += "\(propertyName): \(property.value)\n"
        }
        return desc
    }
}

// Custom Printable value type struct
struct User {
    let firstName: String
    let lastName: String
    let age: Int
}

// Protocol conformance (optional)
extension User: CustomPrintable {
    var emoji: String {
        return "👤"
    }
}

let user = User(firstName: "John", lastName: "Doe", age: 22)
print(user)