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// If you run this in a playground in Xcode 12, you can see the difference in behavior in the live view.

import SwiftUI
import PlaygroundSupport

class Counter: ObservableObject {
    @Published var count: Int
    
    init(_ initialCount: Int) {
        self.count = initialCount

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Advent of Code 2021

Setup

The code below is not specific to any one Advent of Code problem, but instead is used by some or all of the problems.

defmodule AdventOfCode do

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import Combine
import CoreData

extension NSManagedObjectContext {
    func changesPublisher<Object: NSManagedObject>(for fetchRequest: NSFetchRequest<Object>)
        -> ManagedObjectChangesPublisher<Object>
    {
        ManagedObjectChangesPublisher(fetchRequest: fetchRequest, context: self)
    }
}

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package main

import (
	"context"
	"flag"
	"fmt"
	"net"
	"net/url"
	"os"
	"path"

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import SwiftUI

private let linkDetector = try! NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)

struct LinkColoredText: View {
    enum Component {
        case text(String)
        case link(String, URL)
    }