oleksii-demedetskyi

protocol Parsable {
    static func parse(from object: Any) throws -> Self
}

public typealias JSON = [String: Any]

enum ParseError<T>: Swift.Error {
    case cannotConvert(value: Any, toType: T.Type)
}

oleksii-demedetskyi

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

import Cocoa

struct AST {
    let declarations: [Statement]
}

enum Statement {
    case expression(Expression)

oleksii-demedetskyi

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

import Cocoa

struct AST {
    let declarations: [Statement]
}

enum Statement {
    case expression(Expression)

oleksii-demedetskyi

extension Future {
    func then<U>(f: T -> Future<U>) -> Future<U> {
        let promise = Promise<U>()
        self.onFail { promise.fail() }.onSuccess {
            f($0).onFail { promise.fail() }.onSuccess { promise.resolve($0) }
        }
        
        return promise.future
    }
}

oleksii-demedetskyi

import Foundation

public struct Future<T> {
    public let onFail: (() -> ()) -> Future<T>
    public let onSuccess: (T -> ()) -> Future<T>
}

public class Promise<T> {
    private var onFails = [] as [() -> ()]
    private var onSuccesses = [] as [T -> ()]

oleksii-demedetskyi

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

import UIKit

// credit: http://stackoverflow.com/questions/603907/uiimage-resize-then-crop#605385

/// Cropping is a basic and generic operation on top of UIKit,
/// it deserves to be moved to some extension. No need to test it.
extension UIImage {
    func cropToFrame(frame: CGRect) -> UIImage {

oleksii-demedetskyi

struct Counter {
    var value = 0
    
    enum Event { case Increment, Decrement }
    
    mutating func handle(event: Event) {
        switch event {
        case .Increment: value += 1
        case .Decrement: value -= 1
        }

oleksii-demedetskyi

struct Counter {
    var value = 0
    
    enum Event { case Increment, Decrement }
    
    mutating func handle(event: Event) {
        switch event {
        case .Increment: value += 1
        case .Decrement: value -= 1
        }

oleksii-demedetskyi

struct Counter {
    var value = 0
    
    enum Event { case Increment, Decrement }
    
    mutating func handle(event: Event) {
        switch event {
        case .Increment: value += 1
        case .Decrement: value -= 1
        }

oleksii-demedetskyi

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

import Cocoa

var str = "Hello, playground"

struct Test {
    var value: Int = 0
    
    mutating func incrementer() -> () -> () {