How to find the sum of all elements of a given array in JavaScript?-JS Tutorial-php.cn

Table of Contents

Use for loop

Example 2

Output

Use the reduce() method

Home

Web Front-end

JS Tutorial

How to find the sum of all elements of a given array in JavaScript?

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

Aug 24, 2023 pm 02:25 PM

如何在 JavaScript 中求给定数组所有元素的总和？

In programming, it is often necessary to find the sum of all elements in an array. have There are many ways to do this in JavaScript. In this tutorial we will learn about some Method to find the sum of all elements in an array.

Use for loop

Finding the sum of all elements in an array is a very common operation in JavaScript, for loop is the simplest method. If you are using arrays in JavaScript, be sure to utilize a for loop to find the sum of all elements in the array.

In JavaScript, a for loop is a control flow statement that allows you to iterate over a Given an array, object or string. The for loop will execute a set of statements for each element In an array, object or string. In this tutorial we will discuss the benefits of summation Use a for loop to count all elements of a given array.

One of the benefits of using a for loop to find the sum of all elements in an array is Very easy to code. You just create a variable to store the sum and then use The for loop iterates through the array, adding each element to the sum. This is a very concise Method to find the sum of an array.

Example 1

Below is the complete program to sum all elements in an array using for loop -

<!doctype html>
<html>
<head>
   <title>Examples</title>
</head>
<body>
   <h2> Finding sum of all elements using <i>for</i> loop: </h2>
   <div id="array"></div>
   <div id="result"></div>
   <script>
      const data = [2,4,6,8];
      let sum = 0;
      const len = data.length
      for (let i = 0; i < len; i++) {
         sum += data[i];
      }
      document.getElementById("array").innerHTML = "Array = [" + data+ "]";
      document.getElementById("result").innerHTML ="Sum of All Elements: " + sum;
   </script>
</body>
</html>

Copy after login

Output

The code will give the following output .

Finding sum of all elements using for loop:
Array = [2,4,6,8]
Sum of All Elements: 20

Copy after login

There are some disadvantages to using a for loop in JavaScript to find the sum of all elements of a given array. They are as follows -

This is a time consuming process: Find the sum of all elements of an array using for Looping is a time-consuming process. This is because the loop must iterate Find the sum of all elements in an array.
This is a process that consumes memory: this is because, in order to find the sum of all elements elements of an array, all elements must first be stored in memory Then perform the process of finding their sum. This consumes a lot of memory.
This is a processor-intensive process: this is because the loop must iterate Find the sum of all elements of an array.

Use the reduce() method

To find the sum of all elements of an array, you can use the reduce() method. This method applies a function to each element in the array from left to right and returns a value.

reduce() The method takes two parameters: a function and an optional initial value. The function is executed for each element in the array and the return value is used as the new value for the next element in the array. The initial value is optional; if omitted, the first element in the array is used as the initial value.

If the array is empty, or an initial value is specified and the array has only one element, Return the initial value.

Example 2

The following example is implemented using the reduce() method -

<!doctype html>
<html>
<head>
   <title>Examples</title>
</head>
<body>
   <h2> Finding sum of all elements using <i>reduce()</i> method: </h2>
   <div id="array"></div>
   <div id="result"></div>
<script>
   var arr = [2, 4, 6, 8];
   var sum = arr.reduce(function(a,b){
      return a+b;
   }, 0);
   document.getElementById("array").innerHTML = "Array: " + arr;
   document.getElementById("result").innerHTML = "Sum of all elements in the array = " + sum;
</script>
</body>
</html>

Copy after login

Output

The code will give the following output.

20Finding sum of all elements using reduce() method:
Array: 2,4,6,8
Sum of all elements in the array = 20

Copy after login

There are many advantages to using the reduce() method to find the sum of all elements. in an array. First, it is simple and concise. Secondly, it is easy to read and understand. third, It's efficient and fast. Finally, it can be used to sum any type of data, not just number.

The above is the detailed content of How to find the sum of all elements of a given array in JavaScript?. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress images for free

Clothoff.io

AI clothes remover

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)

4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

R.E.P.O. Best Graphic Settings

4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Assassin's Creed Shadows: Seashell Riddle Solution

2 weeks ago By DDD

R.E.P.O. How to Fix Audio if You Can't Hear Anyone

1 months ago By 尊渡假赌尊渡假赌尊渡假赌

R.E.P.O. Chat Commands and How to Use Them

1 months ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

Where is the login entrance for gmail email?

7529

CakePHP Tutorial

1378

What is the format of the account name of steam

win11 activation key permanent

nyt connections hints and answers

Related knowledge

How do I create and publish my own JavaScript libraries? Mar 18, 2025 pm 03:12 PM

Article discusses creating, publishing, and maintaining JavaScript libraries, focusing on planning, development, testing, documentation, and promotion strategies.

How do I optimize JavaScript code for performance in the browser? Mar 18, 2025 pm 03:14 PM

The article discusses strategies for optimizing JavaScript performance in browsers, focusing on reducing execution time and minimizing impact on page load speed.

What should I do if I encounter garbled code printing for front-end thermal paper receipts? Apr 04, 2025 pm 02:42 PM

Frequently Asked Questions and Solutions for Front-end Thermal Paper Ticket Printing In Front-end Development, Ticket Printing is a common requirement. However, many developers are implementing...

How do I debug JavaScript code effectively using browser developer tools? Mar 18, 2025 pm 03:16 PM

The article discusses effective JavaScript debugging using browser developer tools, focusing on setting breakpoints, using the console, and analyzing performance.

Who gets paid more Python or JavaScript? Apr 04, 2025 am 12:09 AM

There is no absolute salary for Python and JavaScript developers, depending on skills and industry needs. 1. Python may be paid more in data science and machine learning. 2. JavaScript has great demand in front-end and full-stack development, and its salary is also considerable. 3. Influencing factors include experience, geographical location, company size and specific skills.

How do I use source maps to debug minified JavaScript code? Mar 18, 2025 pm 03:17 PM

The article explains how to use source maps to debug minified JavaScript by mapping it back to the original code. It discusses enabling source maps, setting breakpoints, and using tools like Chrome DevTools and Webpack.

The difference in console.log output result: Why are the two calls different? Apr 04, 2025 pm 05:12 PM

In-depth discussion of the root causes of the difference in console.log output. This article will analyze the differences in the output results of console.log function in a piece of code and explain the reasons behind it. �...

TypeScript for Beginners, Part 2: Basic Data Types Mar 19, 2025 am 09:10 AM

Once you have mastered the entry-level TypeScript tutorial, you should be able to write your own code in an IDE that supports TypeScript and compile it into JavaScript. This tutorial will dive into various data types in TypeScript. JavaScript has seven data types: Null, Undefined, Boolean, Number, String, Symbol (introduced by ES6) and Object. TypeScript defines more types on this basis, and this tutorial will cover all of them in detail. Null data type Like JavaScript, null in TypeScript

See all articles