dterekhov

// Demonstrates how `map` can be used to unwrap an optional value and execute code if it exists.

var string: String? = "maybe"

// This...
if let string {
  print(string)
}

// Becomes...

dterekhov

// Demonstrates that tuple type aliases with identical structures are considered equal by Swift.

typealias Person = (name: String, age: Int)
typealias Address = (street: String, houseNumber: Int)

let abbey = Person(name: "Abbey Road", age: 29)
let home = Address(street: "Abbey Road", houseNumber: 29)

if abbey == home {
  print("They are structurally equal!") // Works!

dterekhov

// Demonstrates how to use the `#Playground` directive right inside your main project.
// The code inside this block executes immediately when run in Playgrounds.

import SwiftUI
import Playgrounds

#Playground {
  print("Hello")
}

dterekhov

// Demonstrates how to use `#Playground` blocks to test async API calls directly in Playgrounds.

import Foundation
import Playgrounds

#Playground("Categories") {
  let apiService = APIService(urlString: "https://api.escuelajs.co/api/v1/categories")
  
  Task {
    let categories: [Category] = try await apiService.getJSON(dateDecodingStrategy: .iso8601)

dterekhov

// Demonstrates how to use `.glassEffect()` in SwiftUI to create a translucent background effect.
// Available in iOS 18+.

import SwiftUI

struct GlassEffectsView: View {
  var body: some View {
    NavigationStack {
      VStack {
        Text("Hello World")

dterekhov

// Creates a "punched-out" look by grouping layers with `compositingGroup()`
// and cutting out content using `.blendMode(.destinationOut)`. The shadow is
// applied to the merged result of the group.

import SwiftUI

struct CompositingGroupDemoView: View {
  var body: some View {
    ZStack {
      LinearGradient(colors: [.gray.opacity(0.2), .gray.opacity(0.5)],

dterekhov

Tip: Enable Markdown rendering for .md files in Xcode

By default, Xcode does not render Markdown files as formatted text. To enable Markdown rendering for your project:

1. In the project root, create a file named: .xcodesamplecode.plist

2. Add the following XML content:

dterekhov

// Demonstrates hierarchical color variants (primary → quinary).
// Useful for subtle gradients of the same base color without defining new values.

import SwiftUI

struct HierarchicalStylesView: View {
  var body: some View {
    VStack(spacing: 16) {
      Circle().foregroundStyle(Color.red)
      Circle().foregroundStyle(Color.red.secondary)

dterekhov

// ✅ Tip:
// You can right-click an old PreviewProvider block and choose “Convert to Preview Macro” in Xcode 16+.
// This enables advanced preview configurations with less boilerplate and full live state support.

// Demonstrates the modern replacement for PreviewProvider using #Preview macro.
// You can configure traits, states, and multiple previews with concise syntax.

import SwiftUI

struct CounterView: View {

dterekhov

// ✅ Tip:
// ViewThatFits automatically selects the first view that fits within the container, making it perfect for adaptive accessibility layouts.

// Automatically adjusts text to fit the available horizontal space.
// Ideal for dynamic content that varies in length (e.g., dates, titles).

import SwiftUI

struct AccessibilityThatFitsView: View {
  private var titles: [String] {