by Sai gowtham

How to find the sum of numbers in an array javascript

In this tutorial we are going to learn two ways to find the sum of an array of numbers by using JavaScript.

First way using for of loop.


let arr = [1,2,3,4,5];

let sum = 0;

for (let num of arr){

    sum = sum + num
}

console.log(sum) // 15

In the above code, we used for of loop to get the number directly instead of index.

On each iteration, we have added the number to sum variable.


Array.reduce( ) method

There is an inbuilt reduce method in JavaScript which helps to calculate the sum of numbers in the array.

let arr = [1,2,3,4,5];

const sum =  arr.reduce((result,number)=> result+number);

console.log(sum) // 15

In the above code on each iteration reducer function store, the numbers sum inside the result parameter and finally returns the result value.

reduce() method takes the callback function as its first argument and runs that callback function on each element present in the array.

The callback function takes two parameters result and current element.

Css Tutorials & Demos

How rotate an image continuously in CSS

In this demo, we are going to learn about how to rotate an image continuously using the css animations.

How to create a Instagram login Page

In this demo, i will show you how to create a instagram login page using html and css.

How to create a pulse animation in CSS

In this demo, i will show you how to create a pulse animation using css.

Creating a snowfall animation using css and JavaScript

In this demo, i will show you how to create a snow fall animation using css and JavaScript.

Top Udemy Courses

JavaScript - The Complete Guide 2022 (Beginner + Advanced)
JavaScript - The Complete Guide 2022 (Beginner + Advanced)
116,648 students enrolled
52 hours of video content
$14.99 FROM UDEMY
React - The Complete Guide (incl Hooks, React Router, Redux)
React - The Complete Guide (incl Hooks, React Router, Redux)
631,582 students enrolled
49 hours of video content
$24.99 FROM UDEMY
Vue - The Complete Guide (w/ Router, Vuex, Composition API)
Vue - The Complete Guide (w/ Router, Vuex, Composition API)
203,937 students enrolled
31.5 hours of video content
$14.99 FROM UDEMY