nikolaykasyanov

#!/bin/sh

if git status | grep -i 'HEAD detached' > /dev/null 2>&1; then
    echo "You should not commit while in detached state, either create a new brach or checkout existing one before committing."
    exit 1
fi

nikolaykasyanov

class ViewModel {

    init() {
        // accessing underlying subject:
        $buttonTapped
            .asObservable()
            ...
    }
    
    // look ma, no explicit subject property

nikolaykasyanov

Self в Swift и Objective-C

Дисклеймер: речь идёт об однопоточном коде, оставим ужасы параллельного исполнения за скобками. Также не рассматривается возможность overrelease.

Objective-C

Объект точно не ритейнится на время выполнения его метода, пруфы:

• http://clang.llvm.org/docs/AutomaticReferenceCounting.html#self
• https://gist.github.com/nikolaykasyanov/5a2c1fddb7dc5cafd6ea6050128e6c81

nikolaykasyanov

#import <Foundation/Foundation.h>

@interface Node: NSObject

@property (nonatomic, weak) Node *parent;
@property (nonatomic) NSArray *children;

@end

@implementation Node {

nikolaykasyanov

import Foundation

class Child {
    deinit {
        print("Child.deinit")
    }

    var parent: Parent?

    func removeFromParent() {

nikolaykasyanov

class Cmake < Formula
  desc "Cross-platform make"
  homepage "https://www.cmake.org/"
  url "https://cmake.org/files/v3.12/cmake-3.12.4.tar.gz"
  sha256 "5255584bfd043eb717562cff8942d472f1c0e4679c4941d84baadaa9b28e3194"
  head "https://cmake.org/cmake.git"

  bottle do
    cellar :any_skip_relocation
    sha256 "7bcd5ae043d2a6fd5983b026ccdc70b7594e0dbe9de4d367cfcead7edf3c8596" => :mojave

nikolaykasyanov

import Swift


func LCS<T: Equatable>(a: [T], b: [T]) -> [[UInt]] {
    let rows = a.count + 1
    let cols = b.count + 1

    var matrix: [[UInt]] = Array(count: rows, repeatedValue: Array(count: cols, repeatedValue: 0))

    for i in 1..<rows {

nikolaykasyanov

protocol RemoteAPIDelegate: class {
    func remoteAPIDidLoadPosts(_ posts: NSArray)
}

class RemoteAPI {

    weak var delegate: RemoteAPIDelegate?

    func loadPosts() {

nikolaykasyanov

protocol ReachabilityDelegate: class {
    func reachabilityDidChange(_ reachable: Bool)
}

class Reachability {
    weak var delegate: ReachabilityDelegate?
}

class Model: ReachabilityDelegate {
    func reachabilityDidChange(_ reachable: Bool) {

nikolaykasyanov

// Make Optional a monad
extension Optional {
    // Scala style, define `flatMap` directly
    func flatMap<U>(f: (a: T) -> Optional<U>) -> Optional<U> {
        switch (self) {
            case .None: return nil
            case .Some(let value): return f(a: value)
        }
    }