BeauNouvelle

func testRetrieveProductsValidResponse() {
    // we have a locally stored product list in JSON format to test against.
    let testBundle = Bundle(forClass: type(of: self))
    let filepath = testBundle.pathForResource("products", ofType: "txt")
    let data = Data(contentsOfFile: filepath!)
    let urlResponse = HTTPURLResponse(url: URL(string: "https://anyurl.doesntmatter.com")!, statusCode: 200, httpVersion: nil, headerFields: nil)
    // setup our mock response with the above data and fake response.
    MockSession.mockResponse = (data, urlResponse: urlResponse, error: nil)
    let requestsClass = RequestManager()
    // All our network calls are in here.

BeauNouvelle

extension UIBarButtonItem {
    
    /// Typealias for UIBarButtonItem closure.
    private typealias UIBarButtonItemTargetClosure = (UIBarButtonItem) -> ()

    private class UIBarButtonItemClosureWrapper: NSObject {
        let closure: UIBarButtonItemTargetClosure
        init(_ closure: @escaping UIBarButtonItemTargetClosure) {
            self.closure = closure
        }

BeauNouvelle

convenience init(title: String?, style: UIBarButtonItem.Style, closure: @escaping UIBarButtonItemTargetClosure) {
    self.init(title: title, style: style, target: nil, action: nil)
    targetClosure = closure
    action = #selector(UIBarButtonItem.closureAction)
}

@objc func closureAction() {
    guard let targetClosure = targetClosure else { return }
    targetClosure(self)
}

BeauNouvelle

// Old way of doing things.
let actionButton = UIBarButtonItem(title: "Done", style: .done, target: self, action: #selector(someMethod()))

// New way of doing things.
let button = UIBarButtonItem(title: "Done", style: .done) { _ in
    // Do stuff here.            
}

BeauNouvelle

// Add to UIButton extension.
public func touchUpInside(closure: @escaping UIButtonTargetClosure) {
    targetClosure = closure
    addTarget(self, action: #selector(UIButton.closureAction), for: .touchUpInside)
}

// Useage
let button = UIButton()
button.touchUpInside { _ in
    // Do stuff.      

BeauNouvelle

public enum State {
    case alive
    case dead
}

BeauNouvelle

public struct Cell {
    public let x: Int
    public let y: Int
    public var state: State
}

BeauNouvelle

public init(x: Int, y: Int, state: State) {
    self.x = x
    self.y = y
    self.state = state
}

BeauNouvelle

public func isNeighbor(to cell: Cell) -> Bool {

    let xDelta = abs(self.x - cell.x)
    let yDelta = abs(self.y - cell.y)

    switch (xDelta, yDelta) {
    case (1, 1), (0, 1), (1, 0):
        return true
    default:
        return false

BeauNouvelle

let firstCell = Cell(x: 10, y: 10, state: .dead)
let secondCell = Cell(x: 11, y: 11, state: .dead)

print(firstCell.isNeighbor(to: secondCell))
// true - Adjacent row, adjacent column.