Add Clamp() to IntExtensions

eduherminio · eduherminio · May 2, 2020 · Apr 25, 2020 · Apr 27, 2020 · Apr 27, 2020
commit 62953d3bdb29fa236341e4175fe16a3a5c2e69cf
diff --git a/src/SheepTools/Extensions/IntExtensions.cs b/src/SheepTools/Extensions/IntExtensions.cs
@@ -8,5 +8,21 @@ public static int Factorial(this int n)
                 ? n * Factorial(n - 1)
                 : 1;
         }
+
+        public static int Clamp(this int value, int min, int max)
+        {
+            if (value <= min)
+            {
+                return min;
+            }
+            else if (value >= max)
+            {
+                return max;
+            }
+            else
+            {
+                return value;
+            }
+        }
     }
 }
diff --git a/tests/SheepTools.Test/Extensions/IntExtensionsTest.cs b/tests/SheepTools.Test/Extensions/IntExtensionsTest.cs
@@ -24,5 +24,34 @@ public void Factorial()
                 Assert.Equal(pair.Value, pair.Key.Factorial());
             }
         }
+
+        [Fact]
+        public void Clamp()
+        {
+            const int minValue = -3;
+            const int maxValue = +3;
+
+            var testCases = new Dictionary<int, int>()
+            {
+                [int.MinValue] = minValue,
+                [-99999999] = minValue,
+                [-4] = minValue,
+                [minValue] = minValue,
+                [-2] = -2,
+                [-1] = -1,
+                [0] = 0,
+                [+1] = +1,
+                [+2] = +2,
+                [maxValue] = maxValue,
+                [+4] = maxValue,
+                [+99999999] = maxValue,
+                [int.MaxValue] = maxValue
+            };
+
+            foreach (var pair in testCases)
+            {
+                Assert.Equal(pair.Value, pair.Key.Factorial());
+            }
+        }
     }
 }