fix: truthy&falsy.js file

Author: ExploitEngineer

part1 (Basics)/03_var_let&const.js

@@ -1,10 +1,41 @@
-// INFO: Truthry and Falsy Values
+// truthy-falsy.js
+
+// INFO: What are Truthy and Falsy Values?
+
+/*
+In JavaScript, every value is either "truthy" or "falsy" when evaluated in a Boolean context (like inside an if condition).
+
+- **Falsy values** are those that are considered false when converted to a Boolean.
+- **Truthy values** are all other values that are considered true.
+
+Knowing which values are falsy helps avoid bugs and write cleaner conditions.
+
+---
+
+JavaScript's falsy values are exactly these:
+
+1. false
+2. 0
+3. -0
+4. ""
+5. null
+6. undefined
+7. NaN
+
+Everything else is truthy.
+*/
 
 // NOTE: Falsy Values in JavaScript
 if (!false) console.log("false is falsy");
 if (!0) console.log("0 is falsy");
-if (!-0) console.log("-0 is falsy value");
+if (!-0) console.log("-0 is falsy");
 if (!"") console.log("empty string is falsy");
 if (!null) console.log("null is falsy");
 if (!undefined) console.log("undefined is falsy");
 if (!NaN) console.log("NaN is falsy");
+
+// Example of truthy values:
+if ("hello") console.log('"hello" is truthy');
+if (42) console.log("42 is truthy");
+if ([]) console.log("An empty array [] is truthy");
+if ({}) console.log("An empty object {} is truthy");