delegate (predicate)

DevTips/DevTips/Program.cs

@@ -20,6 +20,9 @@ class Program
         // FuncClient.Client();
 
         // Predicate
-        PreicateClient.Client();
+        // PreicateClient.Client();
+
+        // Delegate
+        DelegateClient.Client();
     }
 }

DevTips/DevTips/Tips/DelegateClient.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Linq;
+
+namespace DevTips.Tips;
+
+class DelegateClient
+{
+    public static void Client()
+    {
+        int[] arr = { -10, 20, -30, 4, -5 };
+
+        System.Console.WriteLine("Find");
+        int pos = Array.Find(arr, IsPositive);
+        System.Console.WriteLine(pos);
+
+        System.Console.WriteLine("n >= 0");
+        var v = arr.Where(n => n >= 0);
+        foreach (var elem in v)
+        {
+            System.Console.WriteLine(elem);
+        }
+    }
+
+    private static bool IsPositive(int i)
+    {
+        return i >= 0;
+    }
+}