Added example of the Facade pattern

Author: Habrador

Assets/Patterns/22. Facade.meta

@@ -0,0 +1,42 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Facade.RandomNumbers
+{
+    public class RandomNumberFacade
+    {
+        private static IRandomNumberGenerator rng;
+
+
+        static RandomNumberFacade()
+        {
+            //rng = new RandomNumbersNative();
+            rng = new RandomNumbersUnity();
+        }
+
+
+        public static void InitSeed(int seed)
+        {
+            rng.InitSeed(seed);
+        }
+
+
+        public static float GetRandom01()
+        {
+            return rng.GetRandom01();
+        }
+
+
+        public static float GetRandom(float min, float max)
+        {
+            return rng.GetRandom(min, max);
+        }
+
+
+        public static int GetRandomInt(int min, int max)
+        {
+            return rng.GetRandomInt(min, max);
+        }
+    }
+}

Assets/Patterns/22. Facade/Random numbers.meta

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Facade.RandomNumbers
+{
+    public interface IRandomNumberGenerator
+    {
+        public void InitSeed(int seed);
+
+        public float GetRandom01();
+
+        public float GetRandom(float min, float max);
+
+        public int GetRandomInt(int min, int max);
+    }
+}

Assets/Patterns/22. Facade/Random numbers/Facade.meta

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Facade.RandomNumbers
+{
+    //Generate random numbers by using C#'s System.Random
+    public class RandomNumbersNative : IRandomNumberGenerator
+    {
+        private System.Random rng;
+
+        public RandomNumbersNative()
+        {
+            rng = new System.Random();
+        }
+
+        public float GetRandom(float min, float max)
+        {
+            return (float)((rng.NextDouble() * (max - min)) + min);
+        }
+
+        public float GetRandom01()
+        {
+            return (float)rng.NextDouble();
+        }
+
+        public int GetRandomInt(int min, int max)
+        {
+            return rng.Next(min, max);
+        }
+
+        public void InitSeed(int seed)
+        {
+            rng = new System.Random(seed);
+        }
+    }
+}