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Facade Pattern

Body changes between the two selected stored revisions. Code is not executed.

Before: full revision: 2026-10-25 00:14:03 UTC After: full revision: 2026-10-25 02:09:44 UTC

4 changed sections

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using System; using System.Collections.Generic; using System.Linq; var night = new MovieNight(new Screen(), new Lights(), new Player()); Console.WriteLine(night.Start("Moon")); sealed class Screen { public string Lower() => "screen down"; public string Raise() => "screen up"; } sealed class Lights { public string Dim() => "lights dim"; public string Restore() => "lights normal"; } sealed class Player { public string Play(string title) => "play " + title; public string Stop() => "player stop"; } sealed class MovieNight(Screen screen, Lights lights, Player player) { public string Start(string title) => string.Join(" -> ", screen.Lower(), lights.Dim(), player.Play(title)); public string Stop() => string.Join(" -> ", player.Stop(), lights.Restore(), screen.Raise()); }

using System; using System.Collections.Generic; using System.Linq; var night = new MovieNight(new Screen(), new Lights(), new Player()); Console.WriteLine(night.Start("Moon")); // Separate an individual device operation from multi-device coordination. sealed class Screen { public string Lower() => "screen down"; public string Raise() => "screen up"; } sealed class Lights { public string Dim() => "lights dim"; public string Restore() => "lights normal"; } sealed class Player { public string Play(string title) => "play " + title; public string Stop() => "player stop"; } // Keep the preparation sequence here rather than in every caller. sealed class MovieNight(Screen screen, Lights lights, Player player) { public string Start(string title) => string.Join(" -> ", screen.Lower(), lights.Dim(), player.Play(title)); public string Stop() => string.Join(" -> ", player.Stop(), lights.Restore(), screen.Raise()); }

Content blocks 19 → 19

using System; using System.Collections.Generic; using System.Linq; var night = new MovieNight(new Screen(), new Lights(), new Player()); Console.WriteLine(night.Start("Moon")); Console.WriteLine(night.Stop()); sealed class Screen { public string Lower() => "screen down"; public string Raise() => "screen up"; } sealed class Lights { public string Dim() => "lights dim"; public string Restore() => "lights normal"; } sealed class Player { public string Play(string title) => "play " + title; public string Stop() => "player stop"; } sealed class MovieNight(Screen screen, Lights lights, Player player) { public string Start(string title) => string.Join(" -> ", screen.Lower(), lights.Dim(), player.Play(title)); public string Stop() => string.Join(" -> ", player.Stop(), lights.Restore(), screen.Raise()); }

using System; using System.Collections.Generic; using System.Linq; var night = new MovieNight(new Screen(), new Lights(), new Player()); Console.WriteLine(night.Start("Moon")); Console.WriteLine(night.Stop()); // Separate an individual device operation from multi-device coordination. sealed class Screen { public string Lower() => "screen down"; public string Raise() => "screen up"; } sealed class Lights { public string Dim() => "lights dim"; public string Restore() => "lights normal"; } sealed class Player { public string Play(string title) => "play " + title; public string Stop() => "player stop"; } // Keep the preparation sequence here rather than in every caller. sealed class MovieNight(Screen screen, Lights lights, Player player) { public string Start(string title) => string.Join(" -> ", screen.Lower(), lights.Dim(), player.Play(title)); public string Stop() => string.Join(" -> ", player.Stop(), lights.Restore(), screen.Raise()); }

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TypeScript example Devices own their operations; MovieNight owns the sequence for starting and stopping a movie. Screens avoid repeating that sequence while device behavior stays with each subsystem. // Separate an individual device operation from multi-device coordination. class Screen { lower(): string { return "screen down"; } raise(): string { return "screen up"; } } class Lights { dim(): string { return "lights dim"; } restore(): string { return "lights normal"; } } class Player { play(title: string): string { return "play " + title; } stop(): string { return "player stop"; } } // Keep the preparation sequence here rather than in every caller. class MovieNight { constructor(private readonly screen: Screen, private readonly lights: Lights, private readonly player: Player) {} start(title: string): string { return [this.screen.lower(), this.lights.dim(), this.player.play(title)].join(" -> "); } stop(): string { return [this.player.stop(), this.lights.restore(), this.screen.raise()].join(" -> "); } } const night = new MovieNight(new Screen(), new Lights(), new Player()); console.log(night.start("Moon")); console.log(night.stop()); screen down -> lights dim -> play Moon player stop -> lights normal -> screen up The returned strings are stand-ins that show operation order. They neither control hardware nor make several operations atomic.

Content blocks 24 → 29-30

Each example is a separate .NET 10 console program.

Each C# example is a separate .NET 10 console program. Compile the TypeScript examples for ES2022 or later and run the emitted JavaScript with Node.js.

Facade Pattern

Body changes between the two selected stored revisions. Code is not executed.

4 changed sections

− Removed+ Added21 unchanged content blocks omitted.

Content blocks 14 → 14

using System; using System.Collections.Generic; using System.Linq; var night = new MovieNight(new Screen(), new Lights(), new Player()); Console.WriteLine(night.Start("Moon")); // Separate an individual device operation from multi-device coordination. sealed class Screen { public string Lower() => "screen down"; public string Raise() => "screen up"; } sealed class Lights { public string Dim() => "lights dim"; public string Restore() => "lights normal"; } sealed class Player { public string Play(string title) => "play " + title; public string Stop() => "player stop"; } // Keep the preparation sequence here rather than in every caller. sealed class MovieNight(Screen screen, Lights lights, Player player) { public string Start(string title) => string.Join(" -> ", screen.Lower(), lights.Dim(), player.Play(title)); public string Stop() => string.Join(" -> ", player.Stop(), lights.Restore(), screen.Raise()); }

Content blocks 19 → 19

using System; using System.Collections.Generic; using System.Linq; var night = new MovieNight(new Screen(), new Lights(), new Player()); Console.WriteLine(night.Start("Moon")); Console.WriteLine(night.Stop()); sealed class Screen { public string Lower() => "screen down"; public string Raise() => "screen up"; } sealed class Lights { public string Dim() => "lights dim"; public string Restore() => "lights normal"; } sealed class Player { public string Play(string title) => "play " + title; public string Stop() => "player stop"; } sealed class MovieNight(Screen screen, Lights lights, Player player) { public string Start(string title) => string.Join(" -> ", screen.Lower(), lights.Dim(), player.Play(title)); public string Stop() => string.Join(" -> ", player.Stop(), lights.Restore(), screen.Raise()); }

using System; using System.Collections.Generic; using System.Linq; var night = new MovieNight(new Screen(), new Lights(), new Player()); Console.WriteLine(night.Start("Moon")); Console.WriteLine(night.Stop()); // Separate an individual device operation from multi-device coordination. sealed class Screen { public string Lower() => "screen down"; public string Raise() => "screen up"; } sealed class Lights { public string Dim() => "lights dim"; public string Restore() => "lights normal"; } sealed class Player { public string Play(string title) => "play " + title; public string Stop() => "player stop"; } // Keep the preparation sequence here rather than in every caller. sealed class MovieNight(Screen screen, Lights lights, Player player) { public string Start(string title) => string.Join(" -> ", screen.Lower(), lights.Dim(), player.Play(title)); public string Stop() => string.Join(" -> ", player.Stop(), lights.Restore(), screen.Raise()); }

Content blocks none → 22-26

(No content)

Content blocks 24 → 29-30

Each example is a separate .NET 10 console program.

Each C# example is a separate .NET 10 console program. Compile the TypeScript examples for ES2022 or later and run the emitted JavaScript with Node.js.