JavaScript: Compute the sum of each individual index value of two or more arrays

JavaScript Array: Exercise-19 with Solution

Sum of Arrays by Index

There are two arrays with individual values. Write a JavaScript program to compute the sum of each individual index value in the given array.

Sample array:
array1 = [1,0,2,3,4];
array2 = [3,5,6,7,8,13];
Expected Output:
[4, 5, 8, 10, 12, 13]

Sample Solution:

JavaScript Code:

// Function to calculate the sum of corresponding elements from two arrays
function Arrays_sum(array1, array2) {
 // Initialize an empty array to store the sum of corresponding elements
 var result = [];
 // Initialize counters for iterating through the arrays
 var ctr = 0;
 var x = 0;
 // Check if array1 is empty, return an error message if true
 if (array1.length === 0)
 return "array1 is empty";
 // Check if array2 is empty, return an error message if true
 if (array2.length === 0)
 return "array2 is empty";
 // Iterate through arrays until the end of either array is reached
 while (ctr < array1.length && ctr < array2.length) { // Calculate the sum of corresponding elements and push it to the result array result.push(array1[ctr] + array2[ctr]); // Increment the counter ctr++; } // Check if array1 is exhausted if (ctr === array1.length) { // Append the remaining elements from array2 to the result array for (x = ctr; x < array2.length; x++) { result.push(array2[x]); } } else { // Append the remaining elements from array1 to the result array for (x = ctr; x < array1.length; x++) { result.push(array1[x]); } } // Return the resulting array return result; } // Output the result of the function with sample arrays console.log(Arrays_sum([1, 0, 2, 3, 4], [3, 5, 6, 7, 8, 13])); 

Output:

[4,5,8,10,12,13]

Flowchart:

ES6 Version:

// Function to calculate the sum of corresponding elements from two arrays
const Arrays_sum = (array1, array2) => {
 // Initialize an empty array to store the sum of corresponding elements
 const result = [];
 // Initialize counters for iterating through the arrays
 let ctr = 0;
 let x = 0;
 // Check if array1 is empty, return an error message if true
 if (array1.length === 0)
 return "array1 is empty";
 // Check if array2 is empty, return an error message if true
 if (array2.length === 0)
 return "array2 is empty";
 // Iterate through arrays until the end of either array is reached
 while (ctr < array1.length && ctr < array2.length) { // Calculate the sum of corresponding elements and push it to the result array result.push(array1[ctr] + array2[ctr]); // Increment the counter ctr++; } // Check if array1 is exhausted if (ctr === array1.length) { // Append the remaining elements from array2 to the result array for (x = ctr; x < array2.length; x++) { result.push(array2[x]); } } else { // Append the remaining elements from array1 to the result array for (x = ctr; x < array1.length; x++) { result.push(array1[x]); } } // Return the resulting array return result; }; // Output the result of the function with sample arrays console.log(Arrays_sum([1, 0, 2, 3, 4], [3, 5, 6, 7, 8, 13])); 

Live Demo:

See the Pen JavaScript - Compute the sum of each individual index value of two or more arrays - array-ex- 19 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that computes the element-wise sum of two arrays and returns the result as a new array.
• Write a JavaScript function that handles arrays of different lengths by treating missing elements as zero.
• Write a JavaScript function that uses the map() method to add corresponding elements of two arrays.
• Write a JavaScript function that iterates concurrently over two arrays with a for loop to compute the index-wise sum.

Go to:

• JavaScript array Exercises Home ↩
• JavaScript Exercises Home ↩

PREV : Binary Search.
NEXT : Find Duplicate Values.

Improve this sample solution and post your code through Disqus.