JavaScript: Mean of all digits of a number

JavaScript Math: Exercise-82 with Solution

Mean of Digits in a Number

Write a JavaScript program to calculate the mean of all the digits of a given number.

What is a Mean?
In mathematics, the mean represents the simple average of two or more numbers. There are several methods available for computing the mean of a set of numbers, including the arithmetic mean method, which uses the sum of the numbers in the series, and the geometric mean method, which is the average of a set of products.

Test Data:
(11) -> 1
(66) -> 6
(336) -> 4
(444) -> 4
(1151) -> 2

Sample Solution:

JavaScript Code:

/**
 * Function to calculate the mean of all digits of a number.
 * @param {number} n - The input number.
 * @returns {number} - The mean of all digits of the input number.
 */
function test(n) {
    // Convert the absolute value of n to a string and split it into an array of characters
    let arr_str = String(Math.abs(n)).split('');
    // Reduce the array of characters to the sum of their numeric values and divide by the number of digits
    return arr_str.reduce((a, b) => a + Number(b), 0) / arr_str.length;
}

// Test cases
// Assign value to n
n = 11;
// Print the value of n
console.log("n = " + n);
// Calculate the mean of all digits of the said number
console.log("Mean of all digits of the said number: " + test(n));
// Repeat the above steps for different values of n
n = 66;
console.log("n = " + n);
console.log("Mean of all digits of the said number: " + test(n));
n = 336;
console.log("n = " + n);
console.log("Mean of all digits of the said number: " + test(n));
n = 444;
console.log("n = " + n);
console.log("Mean of all digits of the said number: " + test(n));
n = 1151;
console.log("n = " + n);
console.log("Mean of all digits of the said number: " + test(n));

Output:

n = 11
Mean of all digits of the said number: 1
n = 66
Mean of all digits of the said number: 6
n = 336
Mean of all digits of the said number: 4
n = 444
Mean of all digits of the said number: 4
n = 1151
Mean of all digits of the said number: 2

Flowchart:

Live Demo:

See the Pen javascript-math-exercise-82 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that calculates the arithmetic mean of the digits of a given number by summing and counting the digits.
• Write a JavaScript function that converts a number to a string, computes the mean of its digits, and returns the result.
• Write a JavaScript function that handles negative numbers by using the absolute value before calculating the mean.
• Write a JavaScript function that returns an object containing both the mean and the total digit count from a number.

Improve this sample solution and post your code through Disqus.

Previous: Multiply every digit of a number three times.
Next: Missing number from an array.