Agarunov

//: Playground - noun: a place where people can play


protocol ObjectMapper {
    
    associatedtype SourceType
    
    associatedtype ResultType
    
    func map(_ object: SourceType) -> ResultType

Agarunov

struct Point: Hashable {
    let x: Float
    let y: Float
}

let p1 = Point(x: 0.0, y: 0.0)
let p2 = Point(x: 1.0, y: 1.0)

p1 == p2 // false

Agarunov

class Department { }

protocol Employee {
    // warning: 'weak' should not be applied to a property declaration in a protocol
    // and will be disallowed in future versions
    weak var department: Department? { get }
}

Agarunov

// Declared inside framework
struct Point: Hashable {
    let x: Float
    let y: Float

    init(x: Float, y: Float) {
        self.x = x
        self.y = y
    }
}

Agarunov

#if canImport(UIKit)
// UIKit is available!
import UIKit
#endif

Agarunov

// Swift 4.1
#if targetEnvironment(simulator)
// Simulator!
#endif

// Swift 4.0
#if (arch(i386) || arch(x86_64)) && os(iOS)
// Simulator!
#else
// Device!

Agarunov

let friends = ["Ross", nil, "Joey", "Chandler"]

// Swift 4.0
let array1 = friends.flatMap { $0 } // ["Ross", "Joey", "Chandler"]

// Swift 4.1
let array2 = friends.compactMap { $0 } // ["Ross", "Joey", "Chandler"]

Agarunov

let string = "Hello, World!"
let keyPath = \String.[string.startIndex]
string[keyPath: keyPath]

Agarunov

struct Person: Codable {
    let firstName: String
    let lastName: String
}

let jsonData = """
{
    "first_name": "John",
    "last_name": "Watson"
}

Agarunov

extension Array: Equatable where Element: Equatable {
    static func ==(lhs: Array<Element>, rhs: Array<Element>) -> Bool {
        // do stuff
    }
}