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How to useArray Reduce() Method in Javascript

Approach 2: Using For…of Loop

In this approach, the reduce method transforms each digit of a number into an accumulated sum. It converts the number to a string, iterates, and adds each digit to the sum.

Syntax:

array.reduce( function(total, currentValue, currentIndex, arr), initialValue )

Example: In this example, the sumOfDigit function converts the number to a string, splits it into digits, and then reduces by adding parsed digits, resulting in the sum.

Javascript 
function sumOfDigit(num) {
    return num.toString().split("")
        .reduce((sum, digit) =>
            sum + parseInt(digit), 0);
}

console.log(sumOfDigit(738));

Output
18

JavaScript Program for Sum of Digits of a Number

In this article, we are going to learn about finding the Sum of Digits of a number using JavaScript. The Sum of Digits refers to the result obtained by adding up all the individual numerical digits within a given integer. It’s a basic arithmetic operation. This process is repeated until a single-digit sum, also known as the digital root.

There are several methods that can be used to find the Sum Of Digits by using JavaScript, which are listed below:

Table of Content

  • Approach 1: Using Array Reduce() Method
  • Approach 2: Using For…of Loop
  • Approach 3: Using Math.floor and Division
  • Approach 4: Using forEach
  • Approach 5: Using Recursion


We will explore all the above methods along with their basic implementation with the help of examples.

Similar Reads

Approach 1: Using Array Reduce() Method

In this approach, the reduce method transforms each digit of a number into an accumulated sum. It converts the number to a string, iterates, and adds each digit to the sum....

Approach 2: Using For…of Loop

In this approach, Iterate through each digit of a number by converting it to a string, then use a for…of loop to add parsed digits, resulting in the sum....

Approach 3: Using Math.floor and Division

In this approach, we calculate sum by repeatedly adding last digit using remainder of 10 and updating number by division, until it’s 0....

Approach 4: Using forEach

In this approach, we are converting the number to a string, split it into digits, and use forEach loop to add parsed digits, obtaining the sum....

Approach 5: Using Recursion

In this approach, we use a recursive function to repeatedly add the last digit of the number (obtained using modulo 10) and call itself with the number divided by 10 until the number becomes 0....

Tags:
#JavaScript-DSA #JavaScript-Program #JavaScript #Web Technologies

Approach 2: Using For…of Loop