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This tutorials explains about how to sort array of objects with properties in ascending or descending order.
First create a class and implements CustomStringConvertible and provide implementation for description method.
description is used to print an object when an objects is used for print to console.
import Foundation
class Employee : CustomStringConvertible {
var id: Int;
var name: String;
var salary: Int = 0
init ( _ id: Int, _ name:String, _ salary: Int){
self.id=id
self.name = name
self.salary = salary
}
var description : String {
return "id :\(id) name \(name) salary \(salary)"
}
}
Initialize an array of objects as given below
let employees = [Employee(11,"John",4000),Employee(21,"Mark",9000),Employee(10,"Dego",6000)]
Sort Array of objects in Ascending Order
To sort an object isn ascending order, Provide compare method logic for sorted as given below
let employeesNameAsc = employees.sorted { (initial, next) -> Bool in
return initial.name.compare(next.name) == .orderedAscending
}
for employee in employeesNameAsc {
print(employee)
}
Sort Array of objects in Descending Order
sorted method is provided with compare logic for descending order
let employeesNameDesc = employees.sorted { (initial, next) -> Bool in
return initial.name.compare(next.name) == .orderedDescending
}
for employee in employeesNameDesc {
print(employee)
}
Here is an complete example
import Foundation
class Employee : CustomStringConvertible {
var id: Int;
var name: String;
var salary: Int = 0
init ( _ id: Int, _ name:String, _ salary: Int){
self.id=id
self.name = name
self.salary = salary
}
var description : String {
return "id :\(id) name \(name) salary \(salary)"
}
}
let employees = [Employee(11,"John",4000),Employee(21,"Mark",9000),Employee(10,"Dego",6000)]
let employeesNameAsc = employees.sorted { (initial, next) -> Bool in
return initial.name.compare(next.name) == .orderedAscending
}
for employee in employeesNameAsc {
print(employee)
}
let employeesNameDesc = employees.sorted { (initial, next) -> Bool in
return initial.name.compare(next.name) == .orderedDescending
}
for employee in employeesNameDesc {
print(employee)
}
