feat: add unary operators

Author: ExploitEngineer

part1 (Basics)/20_unary.js

@@ -0,0 +1,26 @@
+// Unary Operators in JavaScript
+
+/*
++    Unary plus (converts operand to number)
+-    Unary minus (negates the operand)
+!    Logical NOT (inverts boolean)
+delete Deletes a property from an object
+void  Evaluates an expression and returns undefined
+*/
+
+// Unary plus
+console.log(+'5');  // Output: 5 (string '5' converted to number)
+
+// Unary minus
+console.log(-5);    // Output: -5
+
+// Logical NOT
+console.log(!true); // Output: false
+
+// delete
+const obj = {a: 1, b: 2};
+delete obj.a;
+console.log(obj);   // Output: { b: 2 }
+
+// void
+console.log(void(0)); // Output: undefined