Update Sum of Numbers.js

Author: ShivamMaurya2002

JavaScript Interview Programs/Sum of Numbers.js

@@ -1,80 +1,106 @@
-// ***************************************************** Common Ways to Add Numbers In JavaScript *************************************************************************
-
-// 1. Normal Variable Addition (Direct Way)
-        const a = 10;
-        const b = 20;
-        const sum = a + b;
-        console.log("Addition of two number:", sum);
-        // output: 
-        // Addition of two number: 30
-
-// 2. Using Function()
-    // Function to calculate the sum of two numbers using a temporary variable:
-    function Sum(a, b){
-        const c = a + b;
-        return c;
-    }
-    console.log("Sum:", Sum(4,5));
-    // Output: 
-    // Sum: 9
+// *************************************************************** Common Ways to Add Numbers in JavaScript ****************************************************************
 
-    // OR
+/* 1. Normal Variable Addition (Direct Way) */
+const a = 10;
+const b = 20;
+const sum = a + b;
+console.log("Addition of two number:", sum);
+// Output: 
+// Addition of two number: 30
 
-    // Function to return the sum of two numbers directly
-    function Sum(a, b) {
-        return a + b;
-    }
-    console.log(Sum(3, 7));
-    // Output:
-    // 10 
-
-// 3.  Using Arrow Function
-    // One-liner arrow function to add two numbers
-    const add = (a, b) => a + b;
-    console.log(add(10, 15)); 
-    // Output: 
-    // 25
-
-    // OR 
-    
-    // Arrow function to add two numbers using a variable and return
-    const Add = (a, b) => {
-        const sum = a + b;
-        return sum;
-    }
-    console.log("Sum of Two Number:", Add(3,2));
-    // Output: 
-    // 5
-
-// 4. Using Rest Parameters (Multiple Inputs)
-    // Function to add any number of values using rest parameters
-    function addAll(...num) {
-    let sum = 0;
+/* 2. Using Function(): */
+
+// Function to return the sum of two numbers directly (Without a temporary variable):
+function Sum1(a, b) {
+    return a + b;
+}
+console.log(Sum1(4, 5));
+// Output: 
+// 9
+
+// OR
+
+// Function to calculate the sum of two numbers using a temporary variable:
+function Sum2(a, b) {
+    const c = a + b;
+    return c;
+}
+console.log("Sum:", Sum2(4, 5));
+// Output: 
+// Sum: 9
+
+/* 3. Using Arrow "=>" Function: */
+
+// One-liner arrow function to add two numbers
+const add = (a, b) => a + b;
+console.log(add(3, 2)); 
+// Output: 
+// 5
+
+// OR 
+
+// Arrow function to add two numbers using a variable and return
+const Add = (a, b) => {
+    const sumArrow = a + b;
+    return sumArrow;
+}
+console.log("Sum of Two Number:", Add(3, 2));
+// Output: 
+// Sum of Two Number: 5
+
+/* 4. Using Rest (...) Parameters (Used for Multiple Inputs): */
+
+// Function to add any number of values using rest parameters
+function addAll(...num) {
+    let sumRest = 0;
     for (let n of num) {
-        sum += n;
-    }
-    return sum;
+        sumRest += n; // sumRest = sumRest + n;
     }
-    console.log(addAll(1, 2, 3, 4)); 
-    // Output: 
-    // 10
-
-
-// 5. Using reduce() Method (on array)
-    // Use reduce() to calculate the sum of array elements
-    let arr = [1, 2, 3, 4, 5];
-    let ADD = arr.reduce((a, b) => a + b, 0);
-    console.log("Addition:", ADD); 
-    // Output: 
-    // 15
-
-    // OR
-
-    // Using reduce() Method with Arrow Function & Curly Braces
-    let arr1 = [1, 2, 3, 4, 5];
-    let Add1 = arr.reduce((a, b) => {
-        return a + b;
-    }, 0);
-    console.log("Addition:", Add1); 
-    // Output: 
-    // 15
+    return sumRest;
+}
+console.log(addAll(1, 2, 3, 4)); 
+// Output: 
+// 10
+
+/* 5. Using reduce() Method (on array): */
+
+// Use reduce() to calculate the sum of array elements
+let arr = [1, 2, 3, 4, 5];
+let ADD = arr.reduce((a, b) => a + b, 0);
+console.log("Addition:", ADD); 
+// Output: 
+// Addition: 15
+
+// OR
+
+// Using reduce() Method with Arrow Function & Curly Braces
+let arr1 = [1, 2, 3, 4, 5];
+let Add1 = arr1.reduce((a, b) => {
+    return a + b;
+}, 0);
+console.log("Addition of the numbers in an Array:", Add1); 
+// Output:
+// Addition of the numbers in an Array: 15
+
+/* 6. Using forEach() to Add All Numbers in an Array: */
+
+// forEach() method to calculate the sum of an array elements using Arrow Function:
+let arr2 = [1, 2, 3, 4, 5, 6];
+let sum2 = 0;
+arr2.forEach(num => sum2 += num);
+console.log("Addition using forEach (using arrow function):", sum2); 
+// Output:
+// Addition using forEach (using arrow function): 21
+
+// OR
+
+// forEach() to calculate sum of array elements
+let arr3 = [1, 2, 3, 4, 5, 6];
+let sum3 = 0;
+// Loop through each element in the array and add it to sum
+arr3.forEach(function (num) {
+    sum3 += num; // sum = sum + num
+});
+console.log("Addition using forEach():", sum3); 
+// Output: 
+// Addition using forEach(): 21