- ✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.
To calculate the sum of all elements in a JavaScript array, you can use various methods. Here are some common approaches:
Using reduce() Method
The reduce() method executes a reducer function on each element of the array, resulting in a single output value.
const arr = [1, 2, 3, 4, 5];const sum = arr.reduce((total, current) => total + current, 0);console.log(sum); // Output: 15Copied!✕CopyUsing for Loop
A traditional for loop can be used to iterate through the array and accumulate the sum.
const arr = [1, 2, 3, 4];let sum = 0;for (let i = 0; i < arr.length; i++) {sum += arr[i];}console.log(sum); // Output: 10Copied!✕CopyUsing forEach() Method
The forEach() method executes a provided function once for each array element.
const arr = [1, 2, 3, 4];let sum = 0;arr.forEach(num => sum += num);console.log(sum); // Output: 10Copied!✕CopyUsing for...of Loop
The for...of loop provides a simpler syntax to iterate over iterable objects like arrays.
JavaScript: 6 Ways to Calculate the Sum of an Array
Sum of an Array in JavaScript - GeeksforGeeks
Jul 23, 2025 · We are going to use the JavaScript reduce () method to find the sum of the array. reduce () is a more elegant way to sum up array elements. It works by processing all the array elements and …
How to find the sum of an array of numbers - Stack Overflow
Dec 13, 2014 · Given an array [1, 2, 3, 4], how can I find the sum of its elements? (In this case, the sum would be 10.) I thought $.each might be useful, but I'm not sure how to implement it.
- Reviews: 4
Code sample
let numOr0 = n => isNaN(n) ? 0 : nconsole.log(["hi", 1, 2, "frog"].reduce((a, b) =>numOr0(a) + numOr0(b)))...JS Sum of an Array – How to Add the Numbers in a …
Mar 31, 2023 · Learn how to add the numbers in a JavaScript array using a for loop, a forEach() method, or a reduce() method. See examples, explanations, and code …
How to Find the Sum of an Array in JavaScript: Using $.each and …
Feb 4, 2026 · In this blog, we’ll explore four detailed methods to sum an array in JavaScript: A classic for loop (beginner-friendly). The forEach array method (readable iteration). The reduce method (concise …
How to sum an array of numbers in JavaScript · CoreUI
Sep 29, 2025 · Use reduce () method to sum array elements efficiently, or loop through values for calculating totals in JavaScript.
How to Sum of an Array in JavaScript - Delft Stack
Mar 4, 2025 · In this tutorial, we explored several methods to sum an array in JavaScript, including using a traditional for loop, the reduce method, and the …
How to Calculate the Sum of Array Values in JavaScript
In this tutorial, we’ll explore three different ways to calculate the sum of array values. Each method includes a full code example and actual output, so you can understand the process end-to-end.
How to Get the Sum of an Array of Numbers in JavaScript
This guide will teach you how to use the powerful reduce() method to sum an array of numbers. We will also cover the traditional for...of loop as a readable alternative.
How to Find the Sum of an Array of Numbers - W3docs
Read this JavaScript tutorial and learn several methods used to find or calculate the sum of an array of numbers. Also, find which is the fastest one.
Skip to content
Accessibility Feedback
