Custom Swift operators to handle array contents

Array+Operators.swift

//
//  Array+Operators.swift
//
//
//  Created by Rob Nadin on 08/01/2016.
//  Copyright © 2016 Rob Nadin. All rights reserved.
//

import Foundation

func <<<T>(inout lhs: [T], rhs: T) {
    lhs.append(rhs)
}

func <<<T>(inout lhs: [T], rhs: [T]) {
    lhs.appendContentsOf(rhs)
}

// MARK: Optionals

func <<<T>(inout lhs: [T]?, rhs: T?) {
    if lhs == nil {
        lhs = [T]()
    }
    if let rhs = rhs {
        lhs! << rhs
    }
}

func <<<T>(inout lhs: [T]?, rhs: [T]?) {
    if lhs == nil {
        lhs = [T]()
    }
    if let rhs = rhs {
        lhs! << rhs
    }
}