From e10e84a3baf3db694f94a0b1b20f530248f0246c Mon Sep 17 00:00:00 2001
From: Parsa Javanshir <79544911+parsajavanshir@users.noreply.github.com>
Date: Fri, 7 Mar 2025 22:00:09 +0330
Subject: [PATCH] Update index.js

1.The functions are now more robust, error-resistant, and easier to maintain.
2.They follow best practices for JavaScript programming.
3.The code is more readable and reusable, making it suitable for real-world applications.
---
 js/index.js | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/js/index.js b/js/index.js
index 26a8125ae..8d764fbbd 100644
--- a/js/index.js
+++ b/js/index.js
@@ -12,7 +12,13 @@ function greetProgrammer() {
   greet("Naureen");
   => "Hello, Naureen!"
 */
+// Function to greet a specific person
 function greet(name) {
+  // Ensure name is a valid string
+  if (typeof name !== "string" || name.trim() === "") {
+    console.error("Please provide a valid name.");
+    return;
+  }
   console.log(`Hello, ${name}!`);
 }
 
@@ -26,6 +32,11 @@ function greet(name) {
   => "Hello, Sunny!"
 */
 function greetWithDefault(name = "programmer") {
+  // Ensure name is a valid string
+  if (typeof name !== "string" || name.trim() === "") {
+    console.error("Please provide a valid name.");
+    return;
+  }
   console.log(`Hello, ${name}!`);
 }
 
@@ -35,10 +46,15 @@ function greetWithDefault(name = "programmer") {
   console.log(sum);
   => 3
 */
+// Function to add two numbers and return the result
 function add(num1, num2) {
+  // Ensure both inputs are numbers
+  if (typeof num1 !== "number" || typeof num2 !== "number") {
+    console.error("Both arguments must be numbers.");
+    return null;
+  }
   return num1 + num2;
 }
-
 /*
   You should be able to call this function with two arguments and get back its return value:
   const result = halve(4);
@@ -49,8 +65,12 @@ function add(num1, num2) {
   const result = halve("two")
   => null
 */
+// Function to halve a number, with input validation
 function halve(number) {
-  if (typeof number !== "number") return null;
-
+  // Check if the input is a valid number
+  if (typeof number !== "number" || isNaN(number)) {
+    console.error("Input must be a valid number.");
+    return null;
+  }
   return number / 2;
 }