Swift: Int incrementation

Int.swift

//
//  Int.swift
//
//  Created by Yan Philippe on 4/22/19.
//  Copyright © 2019 Yan Philippe. All rights reserved.
//

import Foundation

extension Int {
    mutating func increment(with value: Int = 1) -> Void {
        self = self + value
    }
    
    mutating func decrement(with value: Int = 1) -> Void {
        self = self - value
    }
}