kean

// The MIT License (MIT)
//
// Copyright (c) 2016 Alexander Grebenyuk (github.com/kean).

#import <CoreData/CoreData.h>

extern NSString *__nonnull const DFMigrationErrorDomain;

typedef NS_ENUM(NSInteger, DFMigrationError) {
    DFMigrationErrorSourceModelNotFound = 1,

kean

// The MIT License (MIT)
//
// Copyright (c) 2016 Alexander Grebenyuk (github.com/kean).

#import "DFCoreDataMigration.h"

NSString *const DFMigrationErrorDomain = @"DFMigrationErrorDomain";

@implementation DFMigrationManager

kean

+ (BOOL)migrateStoreAtURL:(NSURL *)storeURL
             	   models:(NSArray<NSManagedObjectModel *> *)moms // @[ mom_v1, mom_v2, mom_v3 ... ];
                    error:(NSError **)error {
    // Find an index of the current store's mom
    NSDictionary *meta = [NSPersistentStoreCoordinator metadataForPersistentStoreOfType:NSSQLiteStoreType URL:storeURL error:error];
    if (!meta) {
        return NO;
    }
    NSInteger idx = [moms indexOfObjectPassingTest:^BOOL(NSManagedObjectModel * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        return [obj isConfiguration:nil compatibleWithStoreMetadata:meta];

kean

// The MIT License (MIT)
//
// Copyright (c) 2016 Alexander Grebenyuk (github.com/kean).

import Foundation
import CoreData

enum MigrationError: ErrorProtocol {
    case IncompatibleModels
}

kean

// The MIT License (MIT)
//
// Copyright (c) 2016 Alexander Grebenyuk (github.com/kean).

import Foundation

public class Promise<T> {
    private var state: State<T> = .pending(Handlers<T>())
    private var queue = DispatchQueue(label: "com.github.kean.Promise")
    

kean

books that I would recommend to a friend (not in any particular order, they are all on different topics):

• Pro Git by Scott Chacon
• The Art of Concurrency by Clay Breshears
• Algorithm Design by Jon Kleinberg , Eva Tardos
• Structured Computer Organization by Andrew S. Tanenbaum
• Structure and Interpretation of Computer Programs by H. Abelson and G.J. Sussman
• The C Programming Language by Brian Kernighan, Dennis Ritchie
• Code: The Hidden Language of Computer Hardware and Software by Charles Petzold
• The Pragmatic Programmer: From Journeyman to Master by Andrew Hunt

kean

// MARK - CoreImage

private let sharedContext = CIContext(options: [kCIContextPriorityRequestLow: true])

/// Core Image helper methods.
public extension UIImage {
    /// Applies closure with a filter to the image.
    ///
    // Performance considerations. Chaining multiple CIFilter objects is much
    /// more efficient then using ProcessorComposition to combine multiple

kean

Pod::Spec.new do |s|
    s.name             = 'Nuke'
    s.version          = '4.0-beta3'
    s.summary          = 'A powerful image loading and caching framework'
    s.description  = <<-EOS
    A powerful image loading and caching framework.

    Has full featured UI extensions, support for image filters, optional Alamofire and FLAnimatedImage plugins and [more](https://github.com/kean/Nuke).
    EOS

kean

// The MIT License (MIT)
//
// Copyright (c) 2017 Alexander Grebenyuk (github.com/kean).

import Foundation

/// Proof-of-concept List implementation, not optimized in any way.
///
/// Usage:
///

kean

Problem 4.9. BST Sequences: A binary search tree was created by traversing through an array from left to right and inserting each element. Given a binary search tree with distinct elements, print all possible arrays that could have led to this tree.

Solution.

Let's start with an example.

    4
   / \
  2   5